How to increase site PageRank

I agree with Mikka also, Traffic is more important than PR.. To rank high on SERP is more important than to gain PR..

I agree traffic is much more important than PR. here are some ways from my blog ( http://blog.seooptimizers.com) to help increase traffic:

1) Yahoo Answers
2) Myspace.com
3) Yahoo Groups
4) Stumbleupon.com
5) Post in Forums
6) Craigslist.org
7) Submit Site maps
8) Give out E-Books
9) Website Layout and Design
10) Directory Submissions
11) Tell a Friend (word of mouth)
12) Search Engine Optimization
13) Search Engine Marketing
14) Social bookmarking sites
15) Article Writing and Submission
16) Site Explorer
17) Epinion.com
18) Alexa.com
19) Newsletter Box
20) Scribd
21) Back Links from Relevant Sites
22) Add New Pages to your Site
22) Write and Submit Press Releases
23) Place Ads on Online Classified Ad Sites
24) Use SEO for Firefox Toolbar Plugin
25) Add a Forum to Your Site
26) Add a Blog to Your Site
27) Optimize Your Blog for The Search Engines
28) Comment on Other Blogs
29) MySpace News
30) Digg
31) Banner Exchanges
32) Traffic Exchanges
33) Squidoo.com
34) Technorati and ping it when your blog content changes
35) Use a ping service like pingomatic to ping RSS aggregators
36) Submit Blog to RSS Feed Directories
37) Link to other blogs in your posts
38) Use Stumbleupon to stumble your posts
39) Ask your readers to submit your posts to social bookmarking sites (Digg, Reddit, etc.)
40) Start a group blog
41) Join SpicyPage and promote your blog
42) Join a webring
43) Sign up for BlogWoods and promote your blog
44) Exchange Ads (not blogroll links) with complementary blogs
45) Trade blog roll links with related blogs
46) Use Twitter
47) Publish Keyword Rich Videos on YouTube with your URL
48) Search and Add Wikis Related to your Site
49) Join Hub pages and post links to your blog from articles you write.
50) Web 2.0 Marketing
51) Create a MySpace Page. Put your blog on it, and get some friends.
52) Tell people you will link back to them if they review your blog
53) Most brands are not well established online, you review related content and it will rank well.
54) Review relevant products on Amazon.com.
55) Create product lists on Amazon.com
56) Review related sites on Alexa
57) Review products and services on shopping search engines.
58) Swap some links.
59) Try to get links from within the content of relevant content pages.
60) Sell items on eBay.
61) Target niche social news sites like DZone, Sphinn or Hugg
62) Whenever you send an email to someone, always add your website url as a signature.
63) Do email signature swaps
64) Tag blog posts at social bookmarking sites
65) Add photos to your blog with appropriate keywords - Google Images generates traffic too.
66) Tag blog photos at Flicker
67) Make a custom 404-error page for your website. You can provide a link back to your main website or even try to monetize it by offering a related affiliate program within your niche.
68) Outsource grunt work.
69) After someone orders from you offer a one-time offer that compliments your product.
70) Participate in Blog Carnivals
71) create a network of blogs in different niches, and then link them together
72) Give away stock images with a wee watermark of your URL
73) Find and discuss memes
74) Create a Yahoo Group in the niche your site sits.
75) Bookmark your site on Del.icio.us and if you’re really keen, add a Del.icio.us button to your homepage.
76) Place a free ad for your company on Gumtree.
77) Syndicate your site’s content by using an RSS feeds.
78) Submit your RSS feeds to aggregator sites.
79) Don’t worry about PageRank - worrying about PageRank is as effective as trying to solve an algebra equation by chewing bubblegum.*
80) Get a custom t-shirt made with your website URL on it, and wear it often.
81) Get a custom t-shirt made with your website URL on it, and wear it often.
82) Send out a newsletter!
83) Giving away an eBook is an excellent way to generate word-of-mouth about your site.
84) Ask bloggers and other Web site owners to review your site and/or products.
85) Add a “Tell a Friend” function to your site, so people can easily recommend you to their mates.
86) Share your banners on banner exchange sites.
87) Create a “lens” for your site on Squidoo
88) Do you have really hot content on your site that geeks would love? If so Slashdot will bring you a mass of traffic.
89) upload a favicon.gif file so that your users have a nice icon when they bookmark your site.
90) Set up a feed on MyYahoo.com so your site gets regularly spidered by the Yahoo search
91) Use Ping-0-matic to ping blog directories. Do this every time you publish.
92) Print your blog URL on your business cards, brochures and flyers.
93) Use Trackback links when you quote or refer to other blog posts.
94) Increase the list you ping
95) Use Facebook
96) Social Networking
97) Micro
98) Email Marketing
99) RSS Feeds
100) Get outside links to internal pages
101) Use free hosting and build sites and link them back to your main site.

Well the post above says a lot about web traffic but for getting High PR
you need to make lots of quality backlink from relevant websites. PR depends on the no of backlink and the quality of pages as well. Linkbuilding can be done using several techniques like article submission,blog commenting, forum posting, social bookmarking, press release submission.

keep your website alive with regular content , and then try to get links from quality websites

PR is not useless because its a good indicator to how many authority websites link to yours and most webmasters check the PR of a website to determine value and advertising rates. To increase PR you simply need to increase your backlinks..the more the better and quality is an added benefit.

Page rank is always associated with back links.. To get higher PR value, you need to get tons of back links.. In order to these, you need to participate in all of the SEO strategies.. Make sure that you get quality of back links to get better chances in achieving high PR value..

Page rank is important too. To increase your Page Rank, you must concern on your link building. Get as much as possible quality back link and concern on your out bond link too. Don't too much. Clear all useless link or make it no follow like widget etc.

as pr is not so important but u do
link building
update ur site regularly

I disagree that page rank is useless. A lot of people use that to gauge if your site is legit. It's also good for selling text links to earn a little bit of extra money.

Quality backlinks is very important to get high PR.
try to get more quality back links.
thanks.