What is a good toolkit for developing Blackberry applications?

Looking for a toolkit/SDK for general Blackberry development or application toolkits. Anything like an MVC framework?

My understanding is that blackberry's OS is Java ME - based, and that there's a decent development kit for them. I presume you have already looked over everything here... you can find a lot of information, including the development kit download link.
Regarding model-view-controller, there's no particular framework to my knowledge, but I don't see why you wouldn't be able to take MVC as an approach in the paradigmatic sense. Google has resources out there on java developers working with MVC.