Yeah I'm working at home a lot right now and it's not everything I hoped it would be. There's the nagging feeling all the time that "I could be working on X right now, the computer is right over there..."

It helps to have a real home office, a place you use for work and nothing else, in a separate room if you have the space. It also helps to set "work hours" otherwise you feel sort of like you're always (at least potentially) at work.