Doug Roberts explains the challanges by trying Linux as a desktop platform – and he uses Debian for it.
Read the lengthy article here
Here's another last bit of advice. I recommend dual booting only one absolutely safe way: buy a second hard drive and install Linux on it. This is also the easiest way to get into Linux. No tricky hard disk-partitioning to worry about. No way to mess up your current Windows install. Absolutely the easiest and safest way. Do that, or don't even bother.
Let me end by offering two Linux distributions I would recommend. If you are interested in a commercial version, my pick is SUSE Enterprise Desktop, which should be out shortly after you read this. If you want a community-based distro, try Debian Kanotix. But you will probably want to explore some on your own. Distro Watch is a great place to start. Good luck!