As above, presscoins is a great place to go. However, the information changes and keeping track became difficult. Before my June trip, I need to go through the list of active machines and scratch off the ones I have. As pointed out, Google Docs is a good place to go. Having that active is easy to manage. I have about 500 to get marked off.
I do wish PressCoins would make their information available by spreadsheet. It makes it much easier to track it as a database instead of a checklist.