I'm attempting to compile a list of DC-area web startups/business relating to blogs, RSS and other Web 2.0 applications. Here's my shortlist:

• Wondir
• MindSay
• Slapcast / DodgeIt
• EchoDitto
• DABU/TeacherReviews
• Syndic8 (at least part of it, anyway)
• BottomFeeder
• Blogdigger

Of course there's other companies like WeatherBug and some guys who call themselves AOL, which are probably worth keeping track of. And there's a whole bunch of individuals as well, particularly in web design and development.

I'm sure there are others that I don't know about, please leave them in the comments and I'll update the list.