Until Google Maps allows you to save locations, a bookmarklet (tested in Firefox and Safari) is in order.

Google Directions

To use:

1. Drag the link below to your bookmarks
2. Edit the URL to put in your own address
3. Go to maps.google.com
4. Click the bookmarklet

What it does:

1. Activate the directions tab
2. Fill the ‘start’ field with your address
3. Set focus to the ‘end’ field

Hope someone else finds it useful.