One app on the ipad I haven't been able to find for tablets is a sheet music viewer. ipad has "forscore" which allows viewing scores like a PDF.
I sing in a choir and the direstor uses an ipad as well as several other folks. It should have ability to set multiple "jump to" points, mark-up/highlight, etc. I could be that a PDF viewer can do all this or only need minor mods.
I will be getting a Droid tablet soon and need this type of app. I would think that numerous musically inclined people would love this for the Droid.
Lots of choir directors are using this on the ipad. We need it for those not wanting to go to the dark side.