Communication, communication, communication. I feel this is the key issue to collaboration, and it's not so easy. It's not emails, Skype, texts, or any other software alone, but skills of communication as well as positive and ongoing motivation.
Adams, S. (2009) Strips: December 18, 2009. [online]http://www.dilbert.com/strips/comic/2009-12-18/ [11/02/2010]