MacTech has published a list of the 25 Most Influential People in the Mac Community. Most I agree with. Some I don't. Take a look and decide for yourself. It's definitely a good "name with the face" type of article. It gives you a good reference for MacWorld Expo to know who's who.
I would include Larry O' Conner from Other World Computing, Mike Breeden - writer/owner of XLR8YourMac, and most definitely Arnold Kim - owner/founder of MacRumors.com.