We wanted to know just that and wanted it in an easy format to browse.  Twitterholic was the first to come out with this idea but their data seemed to be always wrong and also very buggy.  There is also Twitdir which is pretty good data wise but we didn't like having to view only 5 entries at a time. (Twitdir also provides a good twitter user search capability)

So, wanting a better solution, we built a top 150 list for you, the readers of Twittown.  It is called Twit Rank .  

You can sort by top friends, followers and updaters and for each you can see the top 150 accounts on twitter . 

We are constantly scanning the twitter public timeline and get new accounts and their data.  Right now we have a decent sampling and feel that the list is fairly accurate.  As time goes on, we will capture more IDs and the list will get better and better.  If you are not listed and your stats say you should be, just be patient, keep twittering and we will find you automatically.  

We know twitter is not about how many friends, followers or updates you have but.. It is sure fun to compare, isn't it? 

Twit Rank is available by clicking on the Twit Rank tab at the top of this page.  Have fun!