Honestly I try to stick to medical journals, or at least summaries aimed at doctors, as much as possible. Although you certainly don't escape the corporate influence that way, it's slightly less pervasive than it is in the consumer-oriented sites, and at least you get to analyze the numbers for youself.

If you do use consumer sites, stick to the ones that are HON code certified and preferably screened by a neutral organization like the National Women's Health Network. IMVHO, user forums are great when you have a problem and need support or a place to vent - not so much for when you're looking for unemotional information.

When I was going through this stuff, DH was absolutely useless to me - I later found out it was because I was reading medical journals and asking him to help me sift the data, while he was reading user forums and completely freaking out. I still don't think he gets it....