FYI, if you have an iphone, and are spending money on a GPS transponder rental.. you're throwing away your money!
pirelli provides a free app (just search for "pirelli") that handles all that good stuff for you.
Did I mention for free?
Some places say its just for iphone 4, but it runs on my iphone3GS as well.
It has a disclaimer on the saved results as "low accuracy", but it seems to be decent enough.
Tracks position(on a mini-map!), speed, and lean angle,even.
The app is named "Diablo Super Biker US". I wish I would have seen this earlier. I just got back from Gatlinburg TN and riding the Tail of the Dragon.