Windows to Linux

I'm thinking about switching to Linux. Specifically Ubuntu or Fedora. Anyone want to tell me why or why I shouldn't? Currently using Vista Home and I like it but I just want to see what else is out there. Plus if its more secure, thats always a plus.

Best way to learn is hands-on. Make sure your hardware is supported, and either slap another hdd into your Windows box, or to resize your partitions to create some free space, and install Ubuntu as a dual-boot.

Or if you're not ready to install, just get your hands on a LiveCD, boot into that, and play around with it some.