Taking a look at my own statistics, at http://tweetstats.com/graphs/louisgray, a few trends are noticeable:
1) I am using Twitter on an increasing basis. While I only averaged about 2.5 Twitter updates a day in February, that number increased to over 3 in March, and more than 4 in April. After 10 days in May, I've reached 50, making that new ratio 5 a day.
2) There are a few gaps in my Twittering behavior. The first is a near-consistent hole from 2 a.m. to 6 a.m. every day, with the exception of Sunday, when it looks like I just might have something to say around 3 a.m. on some nights. The other gap is a near-emptiness during the workweek between 9 and 5, with occasional activity.
3) I use Twitter @replies for just over a third of my updates, with Robert Scoble getting 12, almost twice that of Cyndy of Profy and Frederic of The Last Podcast, who follow with 7 and 6, respectively.
While TweetStats is not new, the new graph of "Aggregate Hourly Tweets" is new, and interesting, updated for the user's local time zone. As my Twitter activity accumulates, mindful of avoiding an increase in my Twitter Noise ratio, I wonder if the patterns will remain the same. If you're curious as to your TweetStats, go to www.tweetstats.com. You can even put in any Twitter ID you wish and pull their data.