@Artmaltman: I'm not sure I'd characterize iT7 as slow and buggy. I think--quite rightly--that Apple got a lot of web-static about the PC version of iT7 as being released before it got debugged. I gather 7.1 and 7.2 are substantially better. After I got my initial kinks with the Emu worked out, iT7 has run fine for me... And, the multiple libraries are pretty useful.
@Warrenh: I've got a Nano and when I hit pause, then play, it continues the shuffle pattern its on... Why not just hit pause and then lock it if you are leaving it for a while? It still dims the screen, and it isn't playing anything, so it shouldn't have that bad an impact on battery life...