Another bit that is really important I find as a remote worker: feedback. While it's nice that you can get long, uninterrupted stretches of work it becomes a problem when you can't get a snappy answer to a simple question because everyone has their head down and is ignoring their email, IMs, etc.

You have to be more up-front with your availability and response times. One thing that irks me working on remote teams is the person who leaves their online status as "available," all of the time. It can be infuriating when you send someone a message and not get a reply for hours. I find you have to manage your statuses a little more carefully. However the payoff is nice because you can't always mediate conversations like that in a co-location setup.