The armory is a really fun site to play with during work down times... when it works. The data mining things you can do with are pretty neat is you are a bored code monkey that plays wow.
What are your favorite things people have done with the armory?
my personal favs are my own:
-Forums Signature Generation (sample below)
-Guild Profession List
-IRC bot Armory plugin to get spec/reputation/and guild info
-"Aqua 2": Water Cooled Intel i7 960, 12 GB DDR3 PC 12800, 3x Intel X-25-M 80 GB SSD RAID 0, SATA 1.5TB WD, EVGA GeForce GTX 470 Supper Clocked Water Cooled, ASUS P6X58D, Corsair 800D w/ Koolance cooling