I've been using Bing since I found the Bing Rewards (http://www.bing.com/rewards), which gives you a point per 2 searches and lets you redeem the points for something later on. I have not found myself going back to Google, yet.
Assuming you make 50 searches per day, you'll make at most $.50 - is it really worth it for a half dollar a day?
And this buried a bit deeper: Search and earn. Earn 1 credit per 5 Bing searches up to 8 a day until Apr 30.