Uh, guys, I hate to break it to you, but cracking on a Palm would not be worth the cost of the batteries (or even electricity). The Palm series is equipped with a Motorola DragonBall processor. The fastest Palm runs at 33MHz.. For reference, my old Mac Performa 550 had a Motorola 33MHz. processor in it, and it cracked at a whopping 9,000keys/sec. That's 100x slower than my current computer, a Power Macintosh G3/266. My computer finishes a block in about 5 minutes. That means that a Palm could finish a block in about 500 minutes, or roughly 8 and a half hours. So you'd get, at best, 3 blocks per day. Not worth it as far as I'm concerned.
Now a PocketPC, that'd be worth a good 100-200K keys/sec at least. Coding for one of those machines might be worth it.
Nick