Silvery - 9:09 pm on Jul 14, 2010 (gmt 0)
Microsoft actually used to have software that checked domain name permutations some years ago, but I can't immediately recall the name of it.
Back then it was freeware as a sort of beta, I think.
It was actually pretty good. I used it when I worked for a Fortune 10 company and tracked down quite a bit of cybersquatting.