Mermaid:
I'm from a snowy region, too. I have purchase tickets on-line through Expedia, USAir, and Northwest over the last few years. I have also been snowbound a few times. Even with e-tickets, I've not had a problem getting rebooked. I always hear that you should get paper tickets in case you need to be reticketed, but I don't know the whole story there. If any one can enlighten me on that, I would appreciate it.
I always make certain that I'm not taking the last flight of the day, so if there is bad weather and you can't make a connection or whatever, there is another flight. In the two cases we were actually stuck overnight due to snow, USAir treated us very well. I was satisfied (of course being "stuck" in Orlando is a pretty good place to be stuck).
Since Orbitz is a combo of the airlines, I would suggest that you might also check pricing and ticketing with the airline that is giving you the best price.