The list is taken from cnet.com and is updated regularly. Here are the current winners/losers…note that the numbers next to the phones are the SAR (specific absorption rate)…the higher it is the more radiation:
 
Ten lowest-radiation cell phones
 
Manufacturer and model SAR level
(digital)
1. LG KG800 0.135
2. Motorola Razr V3x 0.14
3. Nokia 9300 0.21
4. Nokia N90 0.22
5. Samsung Sync SGH-A707 0.236
6. Nokia 7390 0.26
7a. Samsung SGH-T809 0.32
7b. Motorola Razr2 V9 0.32
8. Bang & Olufsen Serene (Samsung SGH-E910) 0.33
9. LG VX8350 0.348
  
Ten highest radiation cell phones:
 
1. Motorola V195s 1.6
2. Motorola Slvr L6 1.58
3a. Motorola Slvr L2 1.54
3b. Motorola W385 1.54
4a. Motorola Deluxe ic902 1.53
4b. T-Mobile Shadow (HTC) 1.53
5a. Samsung Sync SGH-C417 1.51
5b. Motorola V365 1.51
5c. RIM BlackBerry Curve (AT&T) 1.51
6. Sanyo S1 1.48
 
cnet.com reviews

A new study done at Duke University found that ozone exposure in mice at levels approximating unhealthy levels for humans appears to enhance lung injury.
 
“Small amounts of inhaled foreign material can be relatively harmless, since they stimulate an appropriate innate immune response that protects the lungs,” said John Hollingsworth, M.D., pulmonologist and lead author of study whose results appear Oct. 1 in the Journal of Immunology. “However, it appears that ozone causes the innate immune system to overreact, killing key immune system cells, and possibly making the lung more susceptible to subsequent invaders, such as bacteria.”
 
In other words, stay far away from ozone air cleaners. This includes air cleaners that ionize the air (which creates ozone).
 
If you are looking for a high quality air cleaner, there are two kinds that are synergistic.
 
Airfree
 
IQair