Flat pedals on the old Raleigh (errand bike, commutes), toe clips on the touring bike (commuting, longer pleasure rides). I can't afford the $ for clipless at the moment - upgrades to shifters and brakes came first!

I'm getting used to the toe clips - may try Powergrips at some point. However, I am having a problem with my feet that may actually force me into clipless. It would appear that my pedaling style is putting too much pressure on my metatarsal arch and on the joint of my big toe. Stiffer shoes and a fixed point of pressure may help, apparently.