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Well, the obvious answer might be a display case or large glass cabinet with glass shelves (like in museums) if you can afford the cost and space. This is great for physical viewing of the models, but since you are asking the question on an internet forum...

Taking the matter of 'displaying' the models, it depends in what type of media. What I mean is if you want to share your collection on the net, pictures are the logical option. In my opinion, dioramas rule everytime when displaying models in a picture, or even a video (assuming RC cars of course) I guess. If you have a lot of models of the same scale you can just rotate them through three or four dioramas and end up with a great set of pics of your collection.

There is a thread on JW where someone posted a shot of a high quality 1:18 car with some bushes in the background, the car almost looks real (as in 1:1 scale) in the shot!

Will try and dig out a link
8)