Gamertell has posted a list of careers and their "Gameability" - or how likely certain careers allow you to play videogames.
Here are a couple examples from the article:
Reason: At the office all day, when not at the office, you're on call. No free time. Unless you can write off playing Trauma Center as part of your 'professional development.'
Reason: Tons of cases, even more paperwork. Plus they're aren't any games 'challenging' enough for your ego."