I've looked at a number of applications that let me build maps highlighting cities I've been to. I haven't been able to find any (Street and Trips, Excel) that let me do it on the level I'd like to.

Now, I'd like to build a map showing where all of my clients are around the country...would like to include it in my board reports.

Anyone know of good, flexible mapping software that would let me put 'virtual push pins' on cities I've been to, or have clients in?