You can download Tabs or GuitarPro files from your Mac or the web.
It will file them by song title or artist, and you can make a "Favorites List" to quickly get at a play list, or what your working on currently
Max

Android is open source : http://source.android.com/
(Yes, Android is based on Linux, but it's not open source)
For pdf song sheets I use the unRealBook app. Fast and efficient. It also has synching capabilities so all members of my band have iPads mounted on mic stands and one person changes the song and it changes for everybody. I used to use forScore which is good but unrealBook is better.
If your into jazz and real book type stuff iGigbook is good but you have to find the real book pdf's yourself.
iRealB is a great app. Has chord changes for 1200 jazz standards and will generate a jazz combo to accompany you while you practice soloing.
Redpick,This is fascinating and so helpful. Looking at the links for TAPP etc. this is EXACTLY the kind of direction I want to move in with my ( ringbinder ) songsheets in TAB format, to use at weekly guitar meets and take abroad. It's a minefield to a non techie like me and you guys are doing all the groundwork. Thanks. I use Apple and it would make sense for me to add to my laptop and iPod. Seems like I should hold off for the moment given Flash etc. But I can't wait too long, I love to try new things. Keep it going 'til we get to the definitive answer please. This is so good....
Thanks Max,I have been using the iPad for music for about 2 years, and my favorite guitar tab app is TabToolKit.
You can download Tabs or GuitarPro files from your Mac or the web.
It will file them by song title or artist, and you can make a "Favorites List" to quickly get at a play list, or what your working on currently
Max