I had the same problem with my girlfriend. We used to work together then I quit to work for myself. Whenever she had a day off she thought I was just playing on the computer too and just couldn't wrap her mind around the idea that despite the fact that I worked from home, I had to get x, y, and z done before I could go out to dinner or lunch or whatever. Its almost a year now and she left me which sucks but as a twenty-something trying to make it in this economy I have to say my business comes first, at least until I've made the progress I set out to make.
These tips were very good and I've found them to be very true though it can be a challenge to implement them even if you know you should.
Those who work from home should heed my warning: it's not just wives and girlfriends who won't get you're actually working, pretty much everyone else will take a while to get that you're working, not living some awesome fantasy life where you do whatever you want, whenever you want and your bank account just fills with magic funds.