washingtonpost.com has lots of good information, especially if you read the archives.
Thinking back to when I was looking for work, the washingtonpost.com was the best single source, but most major universities have advice (in the form of FAQs) online as well.
There is a tremendous amount of information out there. If you have anything specific let me know and I'll see if I didn't bookmark anything useful.
From personal experience, unless you're looking at a high-up level, professional expereince isn't going to be much help unless you're on the low end of the totem pole, if you are on the upper-end you probably would be more effective researching on your own.
The best help when looking for jobs though is contacts. Almost nothing replaces knowing the right person at the right time.
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Ralphy "Me fail English? That's unpossible." Wiggum