I've used that site before. You have to download their music viewer to view (and print) your downloaded purchases, but that application is free. It's similar to Powertab, in that it plays a midi file along with the notation/tab.
[FONT=Palatino Linotype]"Bust a nut!" - Dimebag
"Imagination is more important than knowledge." - Einstein[/FONT]
"Imagination is more important than knowledge." - Einstein[/FONT]