And on a sad note, TopoZone is dead. Taken over by Trails.com on a fee subscription basis. They'll give you a 14-day free trial, but apparently no more free topos. I wonder how many links to maps I've posted on BBC using topozone.

Try these free downloads
http://www.tnris.state.tx.us/datadownload/download.jsp24k, 100k, 250k scale collared (with border overlap) or collarless (image to the margin of the quad only) digital raster graphic topos and also orthophotos.
If you have the GIS software to use them: digital elevation models (DEM) and contours shapefiles