To start, see HERE.
How cool is this? For example, Yuri (handstand pro. and all-round nice guy) wants to talk to me about the process of epub production—and he lives in Las Vegas. See how easily ha and I can work out business hours overlaps so that we can Skype? Brilliant.
All the other time sites use the GMT system; wonderful in its way, but completely user-unfriendly, compared the the site on the link above. I love clever technology.