Shoes off first. I head for the livingroom first, because it's the first room I need to walk into anyway based on the layout of the apartment, and because it's where my computer is.
Lights go on first so I don't kill myself walking around in the dark, and because my PC is set to turn itself on automatically around the time I normally get home.
First thing I check - well I check my mail before walking in the door because the mailbox is right there. Other - I probably load the forums first, among my various other start pages.
# of keys: 3. Car, doorknob, deadbolt.