Hexagon has a very good UV mapper.... there are Tutorials at VTC.com on it.  problem is that you have to pay for the CD ($100) or do like I did and sign up for the "online classes" which allow you to pay $30  a month and watch anything they have... which by the way is just about anything you could ever want. cancel at any time.  the tut's there are really good. they are a LOT of small 5-6 min vids that are very spacific to what you may be looking for... easy to get the info you want with out having to seach a 1 hour vid.

anyway... there are a bunch of other tut's linked I posted over in the Hex forums

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Hexagon, Carrara, Sculptris, and recently Sketchup.