I finally made it work!! Of course it is very buggy yet, but at least we can have a pre-version of whatsapp in our awesome N900. This was the only app I was missing that other platforms have.

While trying to make it work I got stuck with the "unknown error" after receiving the code via sms, but after editing the prefs.xml file as said in several previous post and asking for the code in the N900 through voice (I received the phonecall and it was the same code as in sms) it worked at last.

I just want to thank you Peter for his job and I hope next releases will be coming soon fixing many of the bugs.