Links (commercial)

Bird Geophysical.  G&M consulting based in Houston

Gamah International.  Mineral exploration consultants

Geophysical Software Solutions (GEOSS).  Potent modelling software

GETECH.  GETgrid, GETeul, GETdigi software. Worldwide gravity and magnetic datasets

ERG Geological Ltd. Exploration consultancy based in Tripoli, Libya.

Gibson Consulting.  G & M Mall. Useful links to many places

Intrepid Geophysics  The Intrepid software system for gravity, magnetic and radiometric data processing and interpretation. 3D Geomodeller Geological modelling.  Reid Geophysics Ltd provides Technical Support in Europe.
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SEARCH ENGINES

Google Advanced. Amazing - it practically reads your mind

Google Scholar. Great for finding references in scientific journals

Google Desktop. Finds stuff on your own disk in a flash.

IXQuick meta-search engine.  Advanced web searching using multiple search engines in parallel. Includes international telephone directory

Scirus. Science search engine from Elsevier