I came across this blog today and it is nice to see that people are trying out the Nimbus L&F even at this early stage.
ThinkFree Office with Nimbus
These screenshots highlight some of the problems we are going to have with getting applications to look good with Nimbus. You can see that a lot of the screen particualy the toolbars and menubar are done with custom components. This raises the issue of getting these to look good with nimbus. Hopefully we can provide some utility classes to help developers to skin custom components. For example that can paint standard gradients and symbols or get L&F colors.