http://www.twitterverse.com
Monitors popularity of words used in Tweets, displayed in a cloud format and covering the last 10 hours…
http://web.forret.com/tools/twitter-tq.asp
http://bradkellett.com/twitter_stats.html
“generate graphs showing your Twitter usage patterns.”
http://www.tweetvolume.com
http://tweetstats.com/
“Generates graphs on how you are spending your time in Twitter.”
http://www.twitstat.com/
“real time Twitter analytics”. Lots of searchable stats, follow @twitstat to be included.
http://www.twitterholic.com/