DH2B and I are OBSESSED with this show!! (OK, maybe *I'm* the only one that's actually 'obsessed')
We were both sick over New Year's weekend so we snuggled up on the couch and had an Office Marathon for four days!! (We have the first 2 season's on DVD, and we have the season pass for Season 3 on iTunes, so we hooked my iPod up to the TV.) Even after all of that, I was still craving more when we were done!
I absolutely LOVE everything about this show. The characters, the writing and I especially love all of the subtle details that they throw in, but you don't even notice most of the time. Since we just watched all of the episodes back to back we noticed a lot more stuff. One example is in the episode 'The Alliance' from Season 1, the Party Planning Committee was discussing what to do for Meredith's birthday and Phyllis suggests green streamers (who is also wearing a green top) and Angela snarks back "Green is whorish"

Then in this year's Christmas episode Angela tells Phyllis to pick up green streamers on her lunch (who is now wearing an orange blouse), Phyllis responds "I thought you said green was whorish" and Angela says back to her "No, orange is whorish".

Poor Phyllis, I adore her!
I didn't read every post on here, so this may have been mentioned already, but a lot of the actual actors on the show have their own MySpace pages. To name a few - Pam, Angela, Kevin, Ryan, Creed, Meredith, a few of the warehouse guys, etc. (Jim & Michael don't, and Dwight did for short time, but it's gone now). They post pics from the sets, and write blogs about what's going on on the show or what happened while filming particular episodes. It's really interesting! One of the prop guys has a page and every Friday he'll post about the episode from the night before. I have some of the people as my friends if you want to check them out - they each have links on their pages to the people that I haven't set as my friends:
www.myspace.com/chrysty
ETA: How great is Ed Helms as Andy?? He's such a perfect addition to the show!! "TUNA!!!" hahaha