Definitely LinkedIn.
You can post your experience, network with your colleagues, and reach out to recruiters (etc) as well as connect to professional groups in your industry.
I'm part of a few groups there, though I am not super-active. Additionally, I tend to update my job-seeker profile each time I revise my resume so they reflect each other more accurately.
I have some general resume updating guidelines left from the "career counseling" service I received as part of my severance package; I can point you to the company/service I used, but I don't know what they charge for individuals so it may not be particularly useful.
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Liz
DD (3/2010)
"Make mistakes! Get messy!" - Miss Frizzle