seanahue.3. always carry-on your boots. that way, even if shit hits the fan and they lose your ski bag, at least you don't have to rent boots. i carry-on my goggles too since they're somewhat fragile
I always carry my boots + 1 pair of ski clothes in my boot bag (ski coat drapes between the straps on top), just in case they delay the bag, you don't miss a day (or 2) of skiing.
I use a Dakine double bag with lots of padding like this one (
http://www.dakine.com/p/backpacks-and-gear/gear-bags/snowboard/high-roller).
I travel about 5-7 times per year, and have already lost a pair of skis to breakage (thanks delta!), so have learned not to skimp on the bag.
Also very important to inspect your skis as soon as you get them. When my skis where broken, I had just gotten home and was tired as shit, so just left the skis in the bag. 2 weeks later when I got them out, discovered one was broken, and you only have 48 hours after landing to submit a claim, so I was shit out of luck