Youv'e got to see this to believe it!!!
Go to the NVidia site
www.Nvidia.com have a look at the keynote address CES2010 particulary the tablet "Tesla" display web pages. Now being a bit of an "it" guru as many of us are here, I can see that you could either stream your sheet music from your own server to the tablet, or use a usb storage device to display. This looks the goods and probably and hopefully will be a cheaper option, allthough I do now have the music pad pro, i'm excited about whats comming up!!
here's the link
http://ispss.istreamplanet.com/nvidia/ make sure you have the latest fLASH PLAYER INSTALLED