I started doing this a month ago, also just 1-2 days a week because that's all the rigorous corporate environment will bear, and I don't know of anybody else doing this on a regular basis. Whatever, enjoy sitting in your cube while I work from my bed, or sofa, or the pool outside.
Huge quality of life improvement. On top of that, working just one day a week from home cuts mileage by 20%, 40% if twice a week! That's a direct reduction in wear and tear that I have to put my old car through, to say nothing of the gasoline savings.
My manager suggested requesting a conference call phone number and a screen sharing account, which I did. I can easily setup impromptu meetings when some group thinking is needed. I am hoping this alleviates the inevitable creep of colleagues thinking I am not pulling my weight. Being very vocal about what you're working on is key, otherwise people will start thinking you're watching TV or walking your dog during business hours.