Tweet Freezer is a app that lets you freeze the tweets for a given search phrase. It will generate the HTML required to reproduce the tweets on other sites. Just see the source of the page to get the HTML.
I have used this script to create the reports for many tweetups, twestivals and barcamps. Some examples...
- Cochin Twestival 2010 Report
- Thiruvananthapuram Tweetup 2 Report
- Cochin Twestival (warning - this is kinda big)