I've been looking for a tool which lets me measure routes accurately without take a trundle wheel out on my run.
I found a new product 'Mapper' which works by using maps from any of the different internet maps sites. You mark out the route you wish to follow, define the scale, and hey presto you get your distance.
It's great for working out how far you've just run or for planning out a route of a specific distance.
Its been developed by two guys who do a lot of running themselves so they know what sort of things runners want from such a tool.
You can get an evaluation copy from http:www.littleredfrog.com