Good ideas for infeed supports George.  I have 3 of these guys I use when needed for infeed/outfeed helpers.  They suit my needs but can be a little of a pain on uneven floors like my shop/driveway.

Nathan, you're right about the downsides of a miter gauge.  I have trouble with longer pieces using mine which is precisely what prompted me to finally make a shooting board.  I'd disagree about the friction issue being a problem for miter gauges though.  More surface area=more drag from friction.  And unless your Dr. Who, your work has to be smaller than your sled 😉  But I agree that friction is a concern in general.  I think in both cases, sled and miter gauge, the greatest source of friction is in the miter slot/runner.  At least on my table saw.  I wish all saw makers would standardize miter slots as dovetails.  When I had my sled, I put formica on the bottom side and that worked great.  

If you go to my project on the bad place, you'll see I built it with two hardwood runners.  I eventually replaced them with a single adjustable runner.