I got a timer on my Palm recently that is just terrific for yoga practice. It’s called PocketDoan, and it’s a free download. It’s designed for meditation, so you can set it to loop in various increments. The sounds are soft (unless you want them not to be), and there’s a good variety of them. I have been setting the timer for a couple of long poses (legs up the wall and Savasana), and using the Tingsha, which I think is the little bell that Holly uses at the end of class, and the cricket chirp. It beats the heck out of some electronic beep or buzz.