Twitster: Twitter Groups For Your Website!

Put simply, Twitster is a PHP application that lets you display tweets on your own web site from everyone you follow in Twitter. What's more, Twitster can filter those tweets by a hash tag (#example) giving you the ability to create a Twitter-based group or community on your own site.

Publish your Twitter community on your own web site.
Gather and publish tweets from the people and the topics you care about.
Powering your site's community with Twitter means little to no work for member participation. (Just tweet!)

http://plasticmind.com/twitster/