There are various advertising options available on Blog Weekends including manual hits, banner impressions and text ad impressions. I recommend the banner impressions because the site is still fairly new and the banners get the most exposure (others may take a bit longer to use the credits).

We currently have an opening special where anyone who signs up will get 100 free manual hits and 500 free banner impressions. You could check it out

I also have an ad spot on http://www.sponsoredtemplates.com for $5 per month if you're interested. Cheers.