I was looking at an Enso clock recently when I found a link to PocketDoan for the Palm. The Enso clock is basically an interval timer to help you in meditation or in your yoga practice. I use it for timing practice so I can concentrate on practice instead of the clock. When I am blowing RO on shakuhachi I can set the 10 minute timer and when 10 minutes is up a soft chime sounds to let me know 10 minutes has elapsed. Instead of spend the $99 on the Enso clock I pulled out my Palm Tungsten E2 and charged it up. I installed the free program and it does everything the Enso clock does and didn't cost anything. So if you have a Palm laying around it might be something you want to check out. There is also a free metronome you can download.