The Pro Pinball tables are the best computer pinball tables I've ever played. I strongly urge anyone who enjoys pinball to buy these.
Onnawave: If you don't have Timeshock, then grab it! (Unless your machine won't handle running it in DOSBox -- it's unfortunate that GOG only offer the DOS version of this one; It means you need a much better machine to enjoy it in high-resolutions). Timeshock is the very best of the set, IMHO.