At Reflex, we are using Samepage as our central communication tool. We send an occasional e-mail here and there, but most of our Powerteam agenda is covered by Samepage these days. But that was not always the case.
In the past, apart from in-person meetings, we used an e-mail group and it was, for the lack of better terms, madness. The issues we discuss are fairly complex. An e-mail might spark three separate topics for discussion.