For transportation related geotechnical engineering, these publications are an absolute must! But all practicing geotechs should find something useful.
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Pile Dynamics, Inc.
Software and equipment manufacturing company for testing and analysis of deep foundations, especially driven piles. Visit Pile Dynamics, Inc.
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Nicholson Construction Company
A very well-respected specialty geotechnical contractor. They have a number of nice technical articles and case studies published on their website. Visit Nicholson Construction Company
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Geotechnical and GeoEnvironmental Software Directory
The Geotechnical and Geoenvironmental Software Directory (GGSD) catalogs over 1,700 programs in the fields of Geotechnical Engineering, Soil Mechanics, Rock Mechanics, Engineering Geology, Foundation Engineering, Hydrogeology, Geoenvironmental Engine Visit Geotechnical and GeoEnvironmental Software Directory