Warp

warp.png This little bit of freeware requires MacOSX 10.5 (Leopard) and what it does is it allows you to set it up so that you can actually switch Spaces with your mouse instead of using keyboard shortcuts. This makes it pretty useful.
If you don’t know what Spaces is, it’s basically the new features in 10.5 that implements virtual desktops. So get Warp now and increase a little bit of functionality that was missing in Spaces.