Right, I've ripped the apk from from my droid to look at the java classes.

I've noticed that the strings are obfuscated in the droid version compared to your version (Symbian I presume)

As for the authentication, I believe this is carried out over standard HTTP, further communication is over XMPP.

Do you have anything working yet, i.e. any communication with the whatsapp server, authentication, im's etc?

Sorry for the delay, really wrapped up with work at the moment.