Actually, it's drastically different from Google, but seeing as almost none of you guys are into marketing or tech, you don't notice it. Insofar as you're concerned, search is search.
Search engines are in the business of selling advertising space, believe it or not.
So, what differences does it offer?
For a start, it offers substantially greater market segmentation for people on the advertising end, and allows the searchers to drill down through their search in a logically progression, similar to the almost entirely unused Google-Wheel feature.
Where it differs from Google, and where you're most likely to notice, is that instead of attempting to return "a great user experience" or "relevant information", which are hazy terms and easily gamed if you're technically minded and patient enough to put in the work, Bing works to facilitate commerce. The majority of search listings it returns are about something that is purchasable. An item for sale or a service for tender.
Google will return whatever it deems to be most relevant by things like page age, inbound links, quality of interlinking, etc.
Bing just wants you to buy something.
And Yahoo!s soon to be released revamped algo wants you to stalk someone...
