First year, stayed with the job I'd had previously as a customer service guy at a tiny manufacturing company. Worked 8 a.m. until 10 a.m., then classes, then 3 p.m. to 5:30 p.m. Nice and flexible. Learned so much at that job.
Second year, got an awesome job working 32 hours every second weekend at a group home for adults with disabilities. Downside was cleaning up poop. Upside was making a couple hundred bucks for basically sleeping, playing board games with adults, and cooking them meals.
Summer between second and third, developed marketing material for a local library. Lots of fun, easy stuff.
Third year I think I slacked off, although I did work as a computer lab proctor for a couple weeks. Boring as hell. Can't really remember why I quit though. Must have had a big student loan.
Fourth year and the extra semester I took, worked for the school newspaper as graphic designer and then copy editor. Made a flat $75 per issue. Worked two hours per issue. Awesome.
Summer in between fourth and the extra semester, had a job doing surveys of rural businesses for the provincial government (got it through a fraternity alum). Drove around the countryside in my '83 Rabbit, asking old couples questions about their business.
For the last two years still managed to be VP and then Pres of my frat, and held Board positions on the campus radio station.
I still took out around $8,000 in loans every year though. Students shouldn't have to have serious or full-time jobs.