Hello YACFers,
Having been working on this for the last n months I thought you lovely people might like to be the first to see it.
http://cycle.travel/ is an 'everyday cycling' website, but with a strong focus towards maps. Click on 'map' (oddly enough) in the top bar and you get to the map and route-planner.
The map itself is intended to highlight important stuff for cyclists, so: minor roads don't disappear into the background (yes, Google, I mean you), NCN routes are shown (but not to the exclusion of all else), there's subtle contours and hillshading, and subject to the limitations of the source data (OSM, of course!) bridleways/tracks are rendered differently according to surface type. Also, cafés and pubs.

The route-planner is a proper draggable one like wot Google does, but more bike-friendly. It likes minor roads and traffic-free paths, (again) takes account of surfaces, and tries to avoid hills if it can. It's pretty fast, so will find you a LEJOG route in a second or two - but that said, anything that long will probably slow down the browser, so better to keep it to a few hundred miles at most.
If you create an account, you can save routes, export them as PDF or GPX, etc. And there's a few other things (like elevation and nearby hotels).
Hope you like it - I've been working on this for ages and am slowly letting it out there to a wider world!