Is a nikon d90 still good without the lens?

If you simply purchase the d90 body, will you still get good shots, or are the additional lenses needed for good images?

Yes it is still good without the lens. Check out the review here:
http://www.amazon.com/...001ET5U92/

Try this experiment: Blindfold yourself and then try describing what you see. A camera without a lens is like being blindfolded. No lens = no picture. In fact, some cameras won't even let you release the shutter if there's no lens attached.

The only exception I can think of is a pinhole camera and if you want to be technical the pinhole acts as a lens of sorts.

So unless you just want a fancy, expensive paperweight buy the camera with a lens.

You definitely need a lens. Without a lens, there's no picture. Nothing to focus the picture so all the camera sensor sees is a blur of light. Different lenses will give you different types of pictures (depending on the lens: telephoto = zoom, macro/micro = close-up, fixed = no zoom (good for portraits. But you NEED a lens. No matter what.

Like a car without gas! A camera needs a lens!

Cameras do not work without lenses.

If you do not understand something incredibly simple like this, you will never figure out how to use a complicated camera like a DSLR.

The camera won't take a picture without a lens attached, if that is what you mean. The body without a lens may or may not be a good thing to buy. It depends on whether you already have good compatible lenses, or if you have plans to buy a different lens than the one bundled in the kit. If you don't have those, the 18-105mm VR that is typically in a D90 kit is reputed to be a good one, and the kit typically costs less than buying them separately.

The D90 is great but without a lens, it's useless.