Inside Dunder Mifflin
With Inside Dunder Mifflin you can take the "What's your management style?" quiz to find out if you're a Michael Scott, a Robert California, or an Andy Bernard. Or find out who would win in a romance battle between Jim and Pam and Phyllis and Bob. Then get everything you need to know about crushing your enemies (who may or may not also be your best friends) from Dwight Schrute, dress for success with Andy Bernard, and take advice from Michael Scott's Ultimate Guide to Business.
On a less fan fiction-y note, this brightly illustrated guide also includes season overviews, top episode dissections, cast profiles, and more.