Useamap

This is the neatest map utility I've seen yet. Choose a name (e.g. myshack)for your map, find your location, annotate the map, and save it to useamap.com/myshack, and hey prest you've got a map at an easy to remember url that you can refer people to. And its free! (sponsoring an event at an offsite location? Take 2 minutes to create a map for invitees!)