I have done a total of 5 seasons and I have to say it is the best way to get out of the boring times of day to day office work etc. Quite often you can find some rather good jobs that will get you good experience in varied employment sectors. The jobs you should look for all depend what you would like to take away from the season. Personally I like hotel work, as you usually get quite a lot of time to ride as well as having accomodaton and food provided. When lookin for a job I tend to use
http://www.snowworkers.com/ as it has a very good range of jobs as well as resort info. The most important thing is to find a job that you will be comfortable with otherwise the season can prove quite hellish.
Good luck and have a good season