Best value for the money. Probably the cheapest primer from Nikon, sharp and provides a wonderful bokeh. A must have in every photographers bag.

Very versatile, all around zoom from Tamron. It stays in my D90 most of the time. However, make sure you get a good copy. There were some complaints about the quality on some of these lenses which had aggravating focus/sharpness issues.

Ccompact but powerful flash unit with i-TTL Speedlight for use with Nikon's Creative Lighting System (CLS). Can operate as a remote wireless unit as well.

Great accessory to keep debris out of your sensor. The D90 has a auto cleaning sensor feature, which helps in keeping the sensor clean but sometimes you have to resort to the blowing power of the Giotto to remove the more stubborn dirt.