I think this is the tool that really shows a true picture of a Twitter User. You can look at any Twitter Id and see what their influence is.
There are a number of interactive graphics that can help show you what your conversations are about and who you are talking to the most.
Also, you can see exactly how many tweets per day you are sending.
Bottom line, it tells you if you are interesting or not. The application can be a little buggy at times, just stay with it and the data will come.
Check it out.