One little bit I forgot to mention about my suggestion, although it's quite important. You'll need a decent quality 2-D image manipulation program to bring the layers together. Suggested programs are PhotoShop, Jasc Paint Shop Pro, and GIMP (freeware - Linux, dunno if it's ported to Windows or Mac.) The ability to hide the model is in the object attributes control. Then save one render with the model, one without, and then a mask render (have subject highlighted before rendering). Open the 2D program. Use the background w/o the subject for the background layer. Then bring in the picture w/ the model as a new layer. Then apply a mask/alpha channel to the new layer so that only the subject model is there. Then apply an appropriate motion blur effect/filter to the background layer. Thus the model on the foreground stays nice and sharp, and the background appears blurred due to motion, etc. If you wanted to even get more technical, you could do multiple layers with different model/object sets. Then each group closer to the foreground (except the subject, which the camera would be tracking) would have a stronger motion blur. If done right, it will look like motion blur with parallax, which gives a nice motion and DOF effect. :)

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.