Awhile back I saw a picture of a reloading bench that had two small parallel rails attached to the counter.  The owner then had several wood bases with various pieces of equipment mounted on each base.  The bases also had rails mounted on them that would slide onto the rails that were mounted on the table and then could be secured with a couple of locking lugs.  It was a neat idea to keep a small bench free of clutter and very modular.  I have searched and was unable to locate the rail system that they were using.  Do you guys have any idea where I could find it?

I believe this is what you're talking about.

http://ultimatereloader.com/2011/03/27/the-new-reloading-bench-system-at-ultimate-reloader/

Its called T-Track and I use it to secure everything down on my bench.  Its the best thing I ever did to improve my bench.

You can get it here.

I installed four sections of "t" rail on my bench top.  I mounted small tools (swager, trimmer. powder measure, chamfer/debur lathe) to wood blocks and find that it works well.  Very convenient.

I got the track at Rockler Woodworking.