I have an associate that is a Geologist/environmentalist who is working on a spill site 100 miles north of the Houston area. It is a small site and when he puts his coods from hand held Garmin the resolution isn't of the quality needed. My question is does anyone know where he can get some high resolution topo to use. Also he was asking what is the best hand held GPS
Google Earth is a decent place to start.
ArcGIS World Imagery is another: http://www.arcgis.com/home/item.html?id=10df2279f9684e4a9f6a7f08febac2a9
you can add layers to the ArcGIS online maps. There are a lot of GIS depots, even state and county GIS sites will let you download imagery and shape files for building nice GIS maps that you can project to different coordinate systems..
"Google Earth is a decent place to start."
How do you get topo data out of Google Earth?