Potentially relevant stuff from brief Google site searches:

• "Studying and Part-time work/supplementary income"
• "Interesting (or semi-interesting) part time jobs?"
• saving money by doing tasks in cheaper, time-consuming ways
• bisserlis talking about joining a temp agency
• "low stress employment/ munchkin income thread"
• "Physics grad student: how to build employability in programming & finance"

I feel like part-time work, and lightweight methods of converting time to money, have been chewed over in even more LW posts, but I can't quickly dig them out.