I found a nifty little program called DontForget that will blink the light (among other things) when you have a message waiting. It's not perfect (e.g. the light turning on/off isn't immediate--it seems like it polls every few minutes to check for a message notification), but it does the trick. I downloaded the beta so that it works with voicemail alerts.

A couple of other nifty things I discovered:

- With the JOGGR, on the second swipe, if you hold, it autoscrolls (but you probably knew that). If you wiggle your finger a little while holding, it accelerates.
- You can lock the phone by holding down the end call (red phone) key.