TaskSpeed is a benchmarking tool for JS Frameworks. It includes tests for jQuery, Mootools, Prototype and Dojo. Dojo 1.3 has proven to be the fastest JS framework on common DOM operations.
Facebook Twitter Style is a small CSS injection to hide some parts of the new Facebook home page to make it cleaner and mimic Twitter, also hides the infamous highlights column. You can also update your twitter status from Facebook using Facebook Twitter Updates script for Greasemonkey.
I just finished a Greasemonkey script that I call “Facebook Twitter Updates” that lets you post Tweets from Facebooks new “Share” feature in 140 characters or less. You will be able to Tweet from Facebook using Facebooks “Share” feature.