Many even biased sources can be amazing sources, you just have to remember to recall the bias. Is Wikipedia likely to bias a math article? Probably not. Would Fox News incorrectly report a giant spool rolling down the road? Probably not.
The nice thing about bias is it's a form of laziness, and as such can often be easily noticed, and subsequently dismissed.
No more. I trust Wikipedia as much as I trust Fox news or CNN or MSNBC now.