Haha, me too, Sneaks!
When I'm working from home I sometimes play something bluesy or jazzy (Howlin Wolf, Muddy Waters, Ella Fitzgerald, Louis Armstrong, Miles Davis etc) - for some reason that works much better at putting me in the modd to work than rock or pop does. But when I'm working at university I listen to my MP3 player on the train, and blues/jazz doesn't work at all then because of train noise, so that's usually something really poppy and upbeat like the Fratellis or silly pop hits I'd be embarrassed to admit to (errr, like Katy Perry or Britney Spears or Kylie, anything that works over the sound of the train!) One extreme to the other really!
I also spend way too much time playing games on Facebook - my morning getting-in-the-mood time seems to stretch out as I think 'oh just one more go then....'