Google Maps came out with a new feature last week called My Maps.  It essentially lets you add placemarks and draw lines and shapes on maps, and it's useful for things like keeping track of vacations and travel and things like that.  It's actually a feature I had been in search of for a little while now.  Google Earth, the downloadable version of Google Maps, does this and has a bunch of other features, so I used that for a while.  But incorporating this into the online version of Google Maps was a great idea.  Plus, there's an option to export a map as a KML file, which is a portable plain text version of your map markers.  Another awesome feature that has basically nothing to do with My Maps is the little blue arrow on the lefthand sidebar, which allows you to show or hide the sidebar.  I always wondered why Maps didn't come with this feature to begin with.  Sometimes you want to hide all the dumb search results and just look at the map.  Now you can.  The final feature I noticed was a right-click menu when your mouse is over a map.  It just has a few functions for marking and manipulating the map.