I'm a fan of google chrome since the day it was released. I love it for its blazing speed. But my web experience is incomplete without stumbleupon. I know it will be a long wait for me to wait for an official stumbleupon toolbar for the chrome.
The solution is same as that for opera. Go to Operastumbler website and login with your stumbleupon credentials. After you are logged in add the following link to your google chrome bookmarks: http://www.operastumbler.com/stumble/
All you have to do to stumble is to click on the above bookmark. Visit http://su.is.dreaming.org/ for more bookmarks for surviving without stumbleopon toolbar. Happy stumbling :-)
UPDATE: Stumbleupon is now toolbarless! Click here for more info.