I just returned from the Microsoft Global Exchange (MGX) sessions in Atlanta and was blown away by all of the great things that Microsoft is doing. More news on that soon ...
I will be going to TechReady soon to get a deeper dive on some of the technologies, including Office Business Applications (OBAs). In preparation for this, I have been going through many of the resources available on MSDN.
Some to check out include:
1. Office Business Applications Developer Portal
2. OBA Sample Application Kits Page