Palm on a Bicycle
jcwise writes: "Want to use your Palm or Handspring as a bike computer? Here are two different products that use completely different approaches. I'm not sure if either are better than a $30 bike computer. With PDA prices falling, it might be a fun hack."
is to get the magellan GPS unit. You get speed, plus you can create a log of your actual route. Absolute altitude is terrible on all GPS units, but you may be able to a pretty good slope reading. THe unit sends normal NMEA strings over a serial connection, so it's relatively trivial to write software for.
Magellan receivers lock on fast, and the handpring/magellan handspring module makes a nice, clean combination (relatively compact as a system, no external cables).
Post may contain irony: discontinue use if experiencing mood swings, nausea or elevated blood pressure.