realistically bias is in the eye of the beholder. Multiple print sources are your best bet to avoid partisan shillery....
Try to read sources from outside the country as well. You would be surprised at what sources in other countries have to say..
I read 5 italian magazines, I get the WSJ, NYT, Chicago Tribune, among 10-15 other websites like politico, salon, and the like...
Try CNN international sometime as well, very refreshing since there are NO commercials exept for CNN shows...
OH forgot to mention the onion...