Telecommuting isn't for everyone. While I'd love to have the option, I don't know that I'd be the best at doing it. As call.copse said, I tend to work at work and do at home things while at home. I am currently doing some remote DBA work on the side and I do miss the interaction with co-workers at that position, of course part of that is because I'm working off-hours so it isn't as easy to interact with them via email, IM, phone, since they are done for the day when I'm doing my thing.

As Ninja has shared, you definitely need to prove you are accomplishing as much or more than when you are at the office. It is even more important to track your accomplishments and get a week status report to the boss when telecommuting, especially when first given the option. Oh, and don't get caught on T.V. at the baseball game when you are "working" from home 😛