If it has to be short, I like http://goo.gl/e#q=stack+overflow

That link sadly does not work for me who uses iGoogle (for now) on google.co.uk.

If it's a short URL you want, then http://bit.ly/YUJZLu. But you'll have to trust me when you click that as you've no idea where it'll take you to.

Right click and copy link, paste into address bar, add a + to the end to see where it goes.

http://bit.ly/YUJZLu+

And that doesn't work on mobile, because they have a "forgetful" mobile site :(