I recently wrote an app using App Inverntor for my Android phone and thought I'd share it if anyone was interested. It was made for my Samsung Galaxy S (Froyo, 480 x 800 screen).
All the action buttons/check boxes can be programmed to send out whatever text you like over a bluetooth connection.
-non-fluid layout (all buttons are hard coded to a position). This means that it may not work well on screens with less res than 480 x 800.
-no multi threading, which means no receiving of information, only sending.
I have source code for the Axon using Webbotlib also if you can't be bothered writing your own.
Edit: can't upload the .apk file. It's too big. PM me your email address if you want it.