I just got an email blast from Twitter, and the Flitter app that Karsten put together for MIX07 was featured prominently:

Mixing It Up

Recently, there was a conference in Las Vegas put on by Microsoft
called MIX and Twitter was used to keep attendees connected as
well as entertained with an interesting application called Flitter.
The application was displayed on giant screens featuring Twitter
updates about what folks at the conference were doing. Neat!
Flitter is open source and anyone can download it:
http://tinyurl.com/257rlu.

I don’t know if every Twitterer got that mail, but even if a fraction did, that’s some fine press. Nice work, KJ!