I think it'd be really cool if you posted about how you marketed the site pre-launch and after-launch (you know, riding the wave, reinforcing the "ideavirus" and all that). I would bet that it'd make it to the top of del.icio.us, too!
I really like this concept because it brings together such a cross-section of potential projects, problems, ideas and approaches (I suppose it helps that the list reads like a who's who of the next wave of successful Web companies and business leaders ;)).
How successful has it been so far? I'm thinking of starting a small-scale one like this for the WFU community -- does actual work get done, and how do people interact?