A while ago, I found a nice ruby script that would keep my Adium's status synced with my Twitter status. I've recently started using twitter a bit more, and replying to friends with it. This basically does a tweet with @username at the start of it. I didn't want these @replies to sync to my Adium's status. So I've modified the original script to ignore these. This script runs every half hour via launchd.
#!/usr/bin/env ruby
#
# Update iChat/Adium status from Twitter
#
# Original Script ...