Geophysical Survey Systems, Inc. (GSSI), is the world leader in the development and manufacture of commercial ground penetrating radar (GPR) systems and electromagnetic induction instruments (EM).
A very nice collection of photos of geotechnical failures, geotechnical construction projects and methods. Put together by Ross W. Boulanger at UC Davis and James Michael Duncan from Virginia Tech, Blacksburg. Visit Geo Photo Album
Partially affiliated with the Geoengineer.org website, this Yahoo! Group has over 900 members that submit geotechnical questions for the entire membership to respond on. Visit Geoengineer Group