you should definetley try linux. it depends on your hardware, but for new hard ware i'd use SLED 10, openSuse, ubuntu, kubuntu, mepis, dreamlinux, slackware, etc.
for older machines, try debain(one of the best), DSL, antix, slax, etc.
there are many distros to choose from, and you'll find that all of them are in ways the same, but have different software, manages, and settings.
like Srunson said, you could try live cd's, which let you expirience linux in a very limited way.
and for eye candy don't forget to use beryl and compiz.
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