Good news for the people on the US west coast - especially fans of topographic maps: I just released TopOSM for Washington, Oregon, California and most of Nevada.

http://toposm.com/usw/

It's still somewhat experimental. A few map sections are missing or incomplete, there are issues with hydrography (lakes, rivers etc) in some areas, and there are other minor graphical issues. And my hosting provider still seems to block you temporarily if you zoom/pan around too much too quickly (presumably because all those map tiles create a lot of requests in a very short time). All in all, however, I think it's good enough to be useful.

The US west coast map is mostly a proof-of-concept test rendering to try out my work on creating arbitrarily-sized TopOSM maps using topography data from the USGS NED and hydrography from the NHD. With the exception of the minor issues mentioned above, it appears to be working. This is an important step toward the long-term goal of providing a complete TopOSM map for the United States (and perhaps eventually the rest of the world).

I also updated the TopOSM page on the OSM wiki with a better description of the project and examples of the TopOSM map style and features, at:

osm.wiki/TopOSM

EDIT: Of course, shortly after posting this, toposm.com goes down. As it turns out, my hosting provider decided to "migrate my account to a different server". Apparently this means that my domain "will be down for up to 72 hours". As if I didn't have enough reasons already to look for better hosting...