unless you have sense 3.5 it wont work on your phone (fyi)
I stumbled on this thread yesterday as my wife has a Rhyme and enjoys the charm dongle. I contacted the developer of LightFlow and will be giving them some hardware info from the phone when I get home from work so they can take a look at it.
NightAngel, is there a better place on AF for this thread as this development would not be specific to the HTC Rhyme? Also, exposing it to a broader android audience may help the Lightflow developers to better gauge user interest in this. I ask because I usually don't wander around the non phone specific forums so I am unfamiliar with them.
NightAngel asked us to help you out by moving this thread for you.
I'm not 100% sure that the Application Development area is what you had in mind, but ping me back via PM or reply to this thread if you think it might belong somewhere else.
I've exchanged a few emails in the past with Andrew, the developer of Light Flow, so you are in very good hands there (and your idea of tying the charm device to his app is very inspired).
Cheers and best of luck!
edit: oh, and if you have a better idea for a thread title, let me know...I almost re-titled it "HTC Rhyme Charm for non-Sense phones", but I thought I'd ask you first since you probably have something in mind.
Possible answer for non Sense phones
