I've had some joy with BT's Web21C SDK for Java. Using the Groovy Scripting language and Google's Data API, I was able to access a Google Calendar and send a text message for each event. Not the best use of either SDK, but at least it was a "proof of concept".
A few things, the Certification Wizard only worked for me via the command line - the GUI caused the VM to blow up. And I needed to compile the groovy script before running, trying to use the groovy command doesn't work (there seems to be a class loading issue).