You can also create your own google map (as long as you have a google account), which you can add pushpins (like in Jeff's picture), pinpoints, lines, shading, label's, etc. You do it all online, and you can make the map public or private, as well as link it to post on forums like this. I've used both, but prefer taking a screenshot, and using Photoshop just because it's more flexible, but creating your own google map is nice, doesn't require downloading/uploading, and it's free.