This sounds like a time bomb waiting to explode. Really scary. If the studies substantiate these suspicions, then the entire mobile industry will be in serious question. (More) Here’s the largest study so far, the Interphone study, which has not yet proven a link.
Here are some things I heard recommended by Dr. Sanjay Gupta on CNN:
1. Do NOT wear your cellphone in your pocket; it should be kept in an approved holster (to reduce the spread of microwaves).
2. Do NOT hold your cellphone to your head. Use speakerphone or an earpiece (but don’t wear your earpiece around when not in use).