Ok, I downloaded the Ubuntu Diablo SDK for Maemo and loaded it via Virtualbox, but I'm uncertain of A) how you load the Maemo OS in there, what program to use, and how do you load and run apps? I'm looking to do some testing and development on a couple apps and I need to know how to load them in the Maemo Diablo environment and run them, and I just need to know how to get started. Any help would be appreciated.

The INSTALL.txt file, in the same folder as the installer scripts, tell you how - read the last section.

Also, when I installed scratchbox for the first time and started to use it; http://www.progbox.co.uk/wordpress/?p=453 taught me a lot.