This is probably a paid promo site, I'm sure there are many more startups in Seattle then those listed. Also, most of them on this site are pretty lame.
Just an FYI, this isn' a paid promo site, it's a community project powered by sponsorship. The only requirement is that the company was in fact started in Seattle and that they're working on it full time. In regards to them being lame, that's a matter of opinion. :)