I've had cycletour.org running for quite a while, providing a good map for planning cycle tours around Australia. Since I'm going to Iceland soon, and couldn't find a good map, I used the same technology to build:
You're very welcome to use it, and feedback is welcome.
The style is quite rough, as I converted it quickly from the Australian one. For weird cartographical reasons, and Iceland being so incredibly far north, I had to quickly change lots of styles, so there are some odd quirks. But I added glaciers (we don't have those...). The data is all OpenStreetMap, and the terrain is SRTM.
If you'd like a similar site for a small* country, I could make one, or if you want to run your own similar site, I can help with that, too.
* Roughly meaning, fewer roads, in total, than Australia.