Could use some more background on what specific aspects of buyer behavior you're most interested in, but there's a lot of great research around this topic.
Whether you're talking consumer or business purchases, it's important to keep in mind that you're still talking about people learning about, finding and buying something they need. It often seems like comparisons of B2C and B2B buying behavior assume the "consumer buyer" and the "business buyer" are two entirely different creatures. They aren't. They're both people.
Basic contrasts of business vs. consumer buying will typically describe larger purchase amounts, more people involved in the buying decision and a longer buying cycle for business buying. These are partially true but often not meaningful - business people will often make $20k purchases of computer hardware without a second thought while a consumer may take much more time deciding which book to buy.
The best current research on the reality behind the business buying process can be found in Enquiro's BuyerSphere series of whitepapers which you can download here -
http://www.enquiro.com/whitep
apers/. The key to much business buying behavior comes down to an assessment of risk.
Can anyone make some suggestions for great resources covering consumer buying behavior?