MacFUSE warning

Just wanted to report that I found a program called MacFUSE installed on my computer (OS X Leopard) somehow. I have no idea how it got there- I certainly never installed it myself. It's not even the type of program I would ever use. I've never seen a program install itself without my permission on a Mac before. This is very suspicious (and awfully Windows-like) behavior. I advise everyone to steer clear of it.