Working virtually is usually as seamless as working down the hall. For times when sharing information with a virtual team member is more complex than what email will allow, there are virtual workspaces. For situations when you need to share files, timelines, calendars in order to be most effective, consider using one of the more popular and user-friendly options: BaseCamp, ClientSpot, and iMeetCentral.
Most have free versions and then different payment plans depending on how robust of a system you would like, and the number of users you will have. A virtual shared workspace is an excellent solution for virtual work teams.