eKalappai 3.0 beta1, first beta version for Open-source ekalappai 3.0 series is released in our project code page - http://code.google.com/p/ekalappai/
It contains Phonetic and tamil99 keyboards. Users can try this and let us know the issues/feedback.
Features available in "eKalappai 3.0 Beta1 version":
1. tamil99 and phonetic support
2. Single click installer/uninstaller
3. Keyboard shortcut (ESC key) to switch between English and Tamil keyboards.
It can be downloaded from http://code.google.com/p/ekalappai/downloads/list.
Its an open-source project and anyone with c++ knowledge can participate. I request C++ programmers help to improve this product. Write to me if you are interested in this project.