Tablet PCs are the big thing at CES 2010. Here’s a look at what HP, Lenovo, and Sony have lined up–as well as at some of the challengers aiming to knock them down.

If this year’s CES is any indication, 2010 is the Year of the Tablet PC. Practically every major consumer tech company is coming out with something thin, touchable, and Twitter-friendly.

The evolution of the tablet PC is similar to that of the laptop computer, the netbook, and the smartphone: Companies aren’t so much selling us a better computer as they are selling us new ways to use computers.

However, consumers want something more portable than a laptop, more powerful than a netbook, and more comfortable than a smartphone–and a new tablet PC could very well fill all of those needs, in many different ways. People who love their e-readers but want something a little more versatile would likely love the Adam by Notion Ink, for example, while fans of touchscreen smartphones should pay close attention to Dell’s concept Android tablet, which could offer similar Internet functions with a much more comfortable user experience.

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