Support for USB encryption keys?

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Hi, I can't seem to find [m]any references to USB encryption key support in Ubuntu, and even Linux in general. I must be searching badly or something because I know people have those keys and I think I've heard some stories of people using hardware encryption keys to encrypt their whole harddrives. So here's my question: what kind of support does Ubuntu (or Linux in general) offer for USB encryption keys? The reason I'm asking is, recently these keys have been going down in price and now cost in the vicinity of $5-10; I even got one for free after rebate recently. here are two that caught my eye recently because of the price: Kensington PCKey LE, Meritline USB PC Security. Any info appreciated! Thanks and Happy New Year!