Yahoo has released its list of top searches for 2010. It has a separate list for mobile searches. (There's a neat graphic at that link.)
Yahoo searchers were more interested in news stories than Bing's searchers, who pretty much just looked up celebrities, though it does have its share--Kim Kardashian made both lists. Yahoo also has specialized lists, such as song lyrics, gadgets, coupons, and includes the top misspellings. Justin Bieber was definitely on many people's minds in 2010.