I like virtual tourist for this. You can create a profile and then start adding the places you visit. Plus you can contact people who live or have recently visited places that you want to go next. I've actually made some friends this way. Cool way to connect. Check it out at
http://www.virtualtourist.com.
In response to the thread:
I have been to every single state in the US (and every national park, most monuments, major museums, etc. etc. etc.)
Internationally -
Canada
Mexico
Bahamas
USVI
Grand Cayman
England
France
Nederlands
Argentina
Norway
Switzerland
Greece
Italy
Costa Rica
Haiti
Vatican
Fiji
New Zealand
Australia
Panama
Jamaica
I'm sure I'm missing a few here and there. My favorite so far is Norway, by far. Very sparsely populated, absolute natural beauty! Looking forward to maybe visiting the Far East soon.