Apple has given us several easy ways to switch spaces in Leopard. I'm using an even easier method that only requires my mouse.
I hardly ever use the horizontal scroll feature of my mouse -- left-and-right scrolling doesn't come up often enough for me to really need it. So I've mapped left scrolling the mouse wheel to the keystroke Control-Left Arrow, and right scrolling the mouse wheel to the Control-Right Arrow. Now just a quick left or right flick of my mouse wheel switches me between my spaces.
If you don't have a mouse with horizontal scrolling, you could program the scroll wheel button to F8 to bring up the Spaces view and then just mouse to the space you need. Either way gives you a easy method that doesn't require moving your hand off the mouse.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20071107091110894