I love Smashing Magazine. It's one of my favorite sites. This article entitled Designing A Facebook Fan Page: Showcases, Tutorials, Resources has shedloads of inspiration and help. It will take a while to load if you're on a slow connection, so please be patient. Scroll down about halfway to get past the example sites and see all the links to tools if that's more what you're interested in. Smashing Magazine has also kindly supplied some Facebook Fan page templates free of charge and listed a couple of commercial ones too at the end. A fantastic resource! And to all you Wordpress theme developers out there, I have a feeling that this will be the next big thing in templates people will need. May be time to learn about a new outlet for your creativity.