I just added the Speedtest.net application to my Android, Google and T-Mobile webpage as a certified gotta have it application for Android phones.  I'm a heavy user of data everywhere I go as well as being constantly tethered to my laptop in order to be productive.  While the little network symbols at the top of the phone is interesting (E, G, 2G, 3G), I'm always curious as to how much bandwidth do I really have and is it enough.  This is an excellent application which has been nicely done with a great interface - makes it very easy to use.  It stores the test information in a local database for review.  My only complaint is it would be nice to be able to edit the database location - in other words, to replace the long and lat numbers with something like home, airport, work, etc.