As always, I plan my trips with Excel. Here’s the one I made for Greece, cleaned up just a bit to remove notes for our group (everybody had access to it), and fixed the formatting a little. I’ve also included a sheet with my actual travel expenses during the trip, and another sheet with these travel notes:
Greece and the rest of Europe uses the Type C or Europlug. My biggest gripe with their sockets is that it’s set lower than normal, so your plug has to be right in the middle, and it has to be round so it can fit. I don’t know how else to describe it, so just check it out this photo on Airliners.net.