I also keep a log of the aircraft that I have flown on. I add to this the name of the F/A on the regional jets and a few notes on aircraft condition, etc.

If you do not get the tail number on a RJ before takeoff, its also located on board on the inside of a galley cubby door. The uppermost cubby on the right hand side. (two seat side of the plane) Just ask the FA to read it to you and then simply rcord it on your palm pilot. As the FA's are typically younger on the RJ flights, you get great service