I was poking around in a command shell on my Droid to see what was available. While it's a pretty restricted environment, there's a number of commands available in /system/bin, including dexopt.
Apparently dexopt isn't something I'm supposed to poke at:
$ dexopt Usage: don't use this
Fring: How not to handle registration
I thought I'd give Fring a try after seeing some favorable reviews on other sites. If you haven't previously heard of Fring, the following blurb from their website might be helpful:
Using your handset's internet connection, you can interact with friends on all your favourite social networks including Skype, MSN …