We all know how to use Google for quick spelling lookups, but weblog Google Operating System suggests you can use the same method for quick URL "spell checks" when the address you're trying isn't working. The "similar addresses" suggestion you see in the screenshot doesn't always show up, but I found that when it doesn't you'll still often receive the classic "Did you mean" correction—both of which should work to find the correct address.
Google Tries to Fix Broken Links [Google...