I have become a great fan of QuickSilver after I finally set it up a couple of months back. I am always doing a Command + Space to bring up QuickSilver now, even when I am not on a Mac!
For people who are on Windows, Skylight could be a good alternative. Lifehacker has an article on it, and they found it pretty impressive. Though they won’t ditch Launchy yet.
And for the Linuxers, there is Katapault.
If you are not using any of these yet, I strongly recommend you get one!
thanks for the tip-off had been looking for a windows alternative to Quicksilver
If you want a good Quicksilver clone for Windows, check out Keybreeze. It seems to be the most customisable, and it has more features than those other apps.