I just released a new app into the Google Play store today called Scratcher Control. It uses the remote sensors protocol to control Scratch projects over wifi. It currently lets you send button presses, touch gestures, accelerometer values, and light sensor values to your projects.
I plan to add more features in the future.
Scratcher Control website:
Scratcher Control on Google Play:
Scratcher Control source code:
Please let me know if anyone has any feedback/suggestions