Remember my "Month-long trip to British Columbia" thread?
Go to http://maps.google.com
Enter the url http://home.off-road.com/~kemanuel/2007_BC/Tracks.kmz into the Google search bar and hit "search maps."
Whoila! Select "hybrid" map and zoom in to see detail.
So this isn't exactly earth shattering tech here but it's fun and relatively ease to do. Go run your favorite trail and have your GPS collect a track (also called a breadcrumb). Your track will be in a GPX format if you're using a Garmin unit. I use a Pocket PC GPS, but it easily converted the data to GPX format. Now, use either an online converter like www.gpsvisualizer.com or load your GPX file into Google Earth to create a Google Earth KMZ file. Save that file somewhere on the internet, open Google Maps and enter the URL for the KMZ file and anyone can view your trip without specialized software.
To go a little further, my software compares the date/hour/minute/second that I took a photograph to the nearest second that a GPS point was collected and it geotags my photos so I know where each one was taken. When the alzheimers kicks in, at least I will know where my photos were taken!