Visit More Countries than your Age in Years
Some friends and I were discussing that a fun way to test how well traveled you are -- Compare the number of countries you have visited versus your age in years. I like the idea as a way to spur you on to see more interesting places.
We found it's actually quite difficult remembering all the countries you have been to, but I've just stumbled across this Visited Countries webapp that uses the Google Charts API to generate a map with your visited countries highlighted. The handy Visited Countries checklist helps keep count.
My Visited Countries total so far is 32, which I'm pleased gives a >1 Countries:Age ratio!
I reckon >1.5 Countries:Age is an ambitious target for 2010 and onwards.