There's a txalaparta piece on the CD I just released with Shira Kammen, and we did 12 shows last December featuring this instrument live. Mine is 8 feet long with 7 exotic harwoods laid over two huge apple baskets. (shutup 'Spaw) Here's a link to the page on our website that tells a little about the instrument...
Two of the best players in the world are Hector and Igor Otoxa. Their group is called Oreka TX, and they helped me in building mine and learning to play last year. They don't have a website but there are sound samples out there somewhere from their album Quercus Endorphina. I'll try to find them and make a link for you-- it's really worth a listen.
Shira & I are lining up a fall tour in Europe for the CD, and I plan to visit Igor & Hector while I'm in Spain to work some more on learning this complex and wonderful instrument.