Robin Garwood points out on the Second Ward, Minneapolis blog that Cyclopath is one awesome bike route mapping tool for the Twin Cities.
It did a great job mapping my home to work bike commute from the Cooper Neighborhood to Eden Prairie:
One common barrier to bike commuting is finding a safe and effective route. This site should give people some great ideas whether they’re looking for a better route to work or the best way to get to a friend’s house.
It’s also editable, so add additional bike friend roads and trails that you know about.