SKI Magazine ~ How to Pack Like a Pro. A great piece about packing like a pro. There is a guy named Doug Dyment from "onebag.com":http://onebag.com who is the expert. His main points are that you can rent great skis, but you want to carry your boots.
Also that your boots count as one carry-on, so most folks allow another personal article which is how you sneak on with just a carryon. He likes by the way something called the Tough Traveler Tri-Zip #4032 which is just 20x13x9 for your clothes. A great suggestion is to wear your ski jacket and your heaviest clothes like you fleece and so forth so you can just stuff it into the thing above.