Archaeogeophysics.org, "a wiki-based website that provide users an opportunity to learn how to process various forms of geophysical data, as well as contribute their own knowledge and experience regarding the use of geophysics in an archaeological context."
The website was developed at California State University Long Beach by the CSULB Program in Archaeological Science with funding from California Department of Transportation (Caltrans).
The site has different parts, on techniques, datasets, tutorials, analysis and integration, software, references, glossary.
This looks like an excellent reference site, and another way that North Americans, in particular, can share expertise and experiences. I'll be exploring it in more detail.