Making Site: Need Ideas

Hi,

I have just been reading the digg.com blog and saw the success of their site, I am going to set myself a personal goal to try and make a site of that size, So I need some ideas of what you tfl users would like as a site.

The idea can be compeltely new or it could be a revamped version of another type of site - I dont mind. Please post all your ideas and tell me in detail not:

A clone of google

I want something from you like:

What about a site like Del.icio.us but instead of having sites have podcasts or something.

The more detail the better.

I want as many ideas to choose from and if the site does become good like digg, You will get credit for the idea.
Steven