Cyclestreets

CycleStreets looks rather neat (British understatement). It's a beta status route planning site for UK cyclists, based on Open Street Map. I've tried it out on a few local routes, and it's not perfect, but it is pretty darn good.

No doubt it will get even better as time goes on and the data improves. Already it's the nearest that I've seen to a reliable service, and it is much easier to use than some others.

There is a feedback form for anything that looks squiffy. So why not give it a try? 

I'd suggest double checking anything it suggests by more traditional methods, because automatic route planning for cyclists is supposed to be pretty difficult. But it might suggest a few new ideas, and there should be plenty of scope for tinkering.