If there are any reading teachers out there that would like to give their students a chance to talk directly to the author of a book they may read in class, here's a list of authors who will Skype with classrooms.
YouCanBook.Me is an appointment scheduling tool that works with Google Calendar. We are looking for a solution for scheduling home visits and parent/teacher conferences. This might work well!
I used this for home visits this past summer and it worked great. For me, the only drawback was less control over scheduling. I was criss-crossing the county a couple of days because they pick the days and times, but otherwise it worked well for me and it was really easy. The parents thought it was easy too.