Google's just opened access to My Maps - a simple way for people to build their own stuff on top of Google Maps.
Basically you can add placeholders, text, pictures and video on to the screen, or draw lines and areas. The maps you create can be private or public, and if you have Google Earth installed, you can view it in 3D too. Basic mashups for dummies stuff.
It's not alone in the market - Ask City is just one example - but it is dead easy to use. I've already started mucking about with it a little, and hopefully will get a chance to play more later. Tell us what you think, or maybe even suggest some mapping projects that we could pitch in with.
