From the point of view of the person working at home, do not ask your colleagues to do anything for you that they wouldn't normally do if you were there at the office. I'm hearing about colleagues who actually sabotage the work of telecommuters. These are people who choose not to do this boundary-blurring stuff, and who resent office mates who do. Interview colleagues once a week early on, and keep asking them how it is working out for them. Companies also need to look closely at the norms and at the expectations they have for their workers.
Some supervisors are uncomfortable managing home-work integrators.
Plenty of managers still want instantaneous hand-holding from their subordinates. They need to understand their own home-work boundaries, and how they assess who's worthy of promotion. Yes, you are going to lose time that could be spent working on other matters while you are duking out these issues. But if you don't, you'll run into bigger problems down the road. Before you decide to trade that sterile cubicle for your living room, make sure that you have the support you need.