There are various Twitter Clients available these days. Even I use lots of Twitter client everyday as all of them are having some unique features. One of the Twitter's wap client is Twitstat. Twitstat also saves the data of the usage of the various twitter clients using unique user/client combinations.
If someone uses multiple clients, they will all be counted. With the help of this we can easily have the understanding of the popularity of the various Twitter clients.
The last data stored on the Twitstat is of 22nd August and it shows that Twitter's own web client still rules the the list of Twitter clients. Just check the link given below to know the position of your favorite Twitter client.