Getting a team to gel means opening lines of communication with everybody. I have my own preferred ways to communicate, but they don't work for everybody, so I've had to adapt. For example, it came as a bit of a shock to me when my boss told me that many of my coworkers were using IM to ask each other quick questions. I hate IM, but it works for them.
As you might guess, I like email. I work best in long-form written English. It's precise, and it leaves a record, but it also creates a certain distance and formality. The telephone is far more immediate and intimate, but it's easy to forget to ask an important question. (I keep lists to remind me.) On the other hand, the improvisational nature of a phone call can help you think of things that might never have occurred to you in the linear, boundaried process of answering an email. And of course face-to-face gives you the chance to add tactile cues, like the dozens of touchy-feely prototypes I keep around my office.
The eight or so most important members of my team are spread across Europe, Asia, and the U.S.; many of them have English as a second language. I can't afford to put additional obstacles in the way of our teamwork, like asking them to email when they prefer talking on the phone because it takes them forever to translate. Having realized this, and adjusted myself to their preferences, I find we're getting better traction than ever.