I use my school's career center a lot (at least this year). They have a large network that any student at the school can use. Many colleges have one, so it can help to start there.
Now, if that doesn't work, you pretty much need to start by hitting the job search engines and classified ads. Job fairs are also an option.
For me, traditional methods work best, at least so far.
One other thing: You can't be afraid to find a company you'd like to work for and apply online (or in person) for a position.
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Past teams:
2003-2007: FRC0330 BeachBots
2008: FRC1135 Shmoebotics
2012: FRC4046 Schroedinger's Dragons
"Rockets are tricky..."--Elon Musk
