I have released "eKalappai 3.0 Alpha version" with following features:
1. tamil99 and phonetic support
2. Single click installer
3. Keyboard short cut (ESC key) to switch between English and Tamil keyboards.
It can be downloaded from http://code.google.com/p/ekalappai/downloads/list .
I request volunteers to use this version and report your bugs in this page:
http://code.google.com/p/ekalappai/issues/list