datatopographywms
Now that Terraserver has been shut down (or at least that's how it appears), is there an alternative WMS server for US topo maps? Probably too much to hope to find one that provides vector layers rather than rasters.
About a year ago this similar question appeared (actually bulk download of topo maps), but back then Terraserver was still in operation and appeared in several of the answers.
MapConnect has 1:250k data for download in many formats, including as ECW rasters which can be converted to GeoTiff with GDAL if needed. They also have a partial coverage of 1:50k topographic maps, but they cost money.
If you're interested in creating your own topographic maps, check out TopOSM, which aims to produce high-quality topographic maps from open data, and includes the source code to do so if you're willing to get your hands dirty. You might also find some hints in this quesion.
Carta topográfica escala 1:50 000
Three major scales are available: 1:1,000,000; 1:250,000 and 1:50,000.
The DRG maps in the scale of 1:50,000 are being issued and as of today (August 2008) about 85% of the country is available.. They have the same format characteristics as the 1:250,000 ones.
The 1:50,000 maps have shading to help in the terrain contour interpretation.
There are vector versions of these maps on both the 1:50,000 and 1:250,000 scales. For the 1:50,000 they are available for 60% of the country and for the 1:250,000 the whole territory is available.
The vertical divisions numbered 11 to 16 are the UTM zones in which Mexico lies.
http://www.bicimapas.com.mx/EnglishEdition/MexicanTopoMaps.htm
http://www.inegi.org.mx/geo/contenidos/topografia/default.aspx
http://www.inegi.org.mx/geo/contenidos/Topografia/Carta50000.aspx
Best Answer
If I read correctly, you are looking for a replacement for the WMS service of the USGS Quad Maps. From what I can find, there doesn't seem to be a direct replacement for that. I think the closest you are likely to find is using the Seamlesss Data Warehouse. This is the USGS data portal for all the orthoimagery that they supply as well as their National Elevation Dataset layers, in various resolutions. These represent some of the raw data used in the Topos, so there would be additional processing necessary.
The link to the area that has the WMS Service information is here: Link
I can't immediately find vector information there that is available as a WMS, however you are able to download Places, Transportation, Boundaries, Hydrography, etc. through the Seamless site. I suppose in the future, they could add additional layers as WMS or even WFS services in that section of the website.
Hope this helps!