Iron Fork: Eat the web safely
Chromium now with GreaseMonkey.. Chromium Iron soon to sport both adblocking and GreaseMonkey!
Its almost pass acid test 3: http://acid3.acidtests.org
Expect something more soon from –enable-greasemonkey
Until then try GreaseMetal: http://greasemetal.31tools.com/
Greasemetal modifies the behaviour of Google Chrome using an inter-process communication channel called AutomationProxy, which is used for automatically testing the functions of the web browser.
With Chrome and the google suite: All Your Base Are Belong to Google