One of the best features that Google has added to many of it’s services that cross between it’s consumer and Apps-branded offerings is the ability to easily select which account you actually mean to use for that service. This is especially useful if you’re like me and you use several Google Apps accounts, as you can see to the right (parts of the addresses are blanked out for privacy reasons of course).
I’ve seen this for a few of their services, not just Docs as shown to the right. They’ve had this for a while, I just never got around to posting how much I appreciated it until now.