Inspired by the "Hide Twitter Stats" script by John Keynes http://userscripts.org/scripts/show/44322 here's the pure CSS version.
Advantage of using Stylish instead of Greasemonkey is that the Stylish styles are applied instantly, instead of "onLoad".

See the article "The Tyranny of Twitter Stats" by Darren Barefoot for background info:
http://www.darrenbarefoot.com/archives/2009/03/the-tyranny-of-twitter-stats.html

April 2nd, 2009
Updated for newest Twitter UI. I added !important declarations to all statements.