Hello everyone - I think the long silence deserves an explanation. No, I am not over indulging in the early warm season this year!
PhoneLeash 2.0 -- the version with C2DM -- is essentially complete. As a reminder this release brings reply-to-SMS-from-email capability to everyone not just those fortunate in having email-to-SMS functionality from their cell operator (which is unavailable or very pricey almost everywhere but the US, and some Canada). It works but ...
Android cloud-to-device messaging is a simple way of asking Google to deliver a "ping" to a specific app on a specific device. The device would then wake up and do whatever it has to do which for PhoneLeash is to download the reply you sent via email and forward it over SMS. The problem with C2DM is that its not reliable. Sometimes the message is pushed in 5-10 seconds, sometimes its many minutes. If the device is asleep (early morning) the messages won't reach until you drag yourself out of bed and tap your phone to life. That doesn't sound like hitech magic at all!
So I am not very happy about putting it out with caveats and explanations. I think its worth a week or two of experiments to see what more can be done. Just thought I'd let everyone know. At the end of it all, 2.00 will certainly mean added functionality to large a number of email users, and at least the current level for everyone else with some usability improvements.