I know of a great reason, and I may get some people upset with this, but the integrated maemo client is garbage. I am hoping that tapioca will eventually either integrate into AIM or provide a means for contact management. That said I know that some people say the googletalk client on 770 works great, it just has never worked for me. If using IPKALL googletalk client crashes when I recieve unauthorized incomming calls. This makes free incomming calls kind of worthless.

Today for the first time I was able to make outgoing calls and use my 770 for the first time to accept ANY incomming call without the application crashing.

Woo Hoo

Well that being said Tapioca is lacking when it comes to features, and it did crash one time on me, but it still is better for me than the integrated gtalk client.

Awesome job, can't wait to see future versions. And it is way cleaner than Gizmo, Gizmo seems to be really heavy on the system.