Congrats fellow D90 owner!

If you need a little more help with the D90 (or any DSLR), I would highly recommend the Magic Lantern guides. They're unique to each camera model. The one for the D90 is supposed to be released in February of '09.

The Magic Lantern series have always been fantastic. They're like a suped-up owners manual, but written in a way that's actually somewhat enjoyable to read. It tells you how to configure the settings but also the why behind those settings.

M80v2 | VP150v2 | QS8v2
SVS Pci+ 20-39
Emotiva UMC-1 & LPA-1
M22ti + T-Amp, in the Office