longjourney -- Yes, passportstamp does everything I need, unfortunately it doesn't quite work and is no longer maintained. Are you using it? It is very buggy for me: It keeps forgetting or deleting dates you enter for visits, you can not enter multiple visits, most links are dead, etc... But yes, a working version of this is exactly what I'm looking for!
WillTravel -- How? What does it do? I signed up but didn't really see the functionality I'm looking for. Can I specify the dates I've entered and left each country, and have it automatically list all countries I've been to and how many times or days I've been to each?