COMPRES (Consortium for Materials Properties Research in Earth Sciences)
Bayerisches Geoinstit
Depths of the Earth Lab (Arizona State)
MIT Experimental Petrology
Caltech Experimental Petrology
Magma Factory (TIT, Japan)
Institute for Study of the Earth's Interior (Misasa, Japan)
Geophysical Lab (Carnegie Insitution of Washington)
ETH (Zurich)
GSECARS
HPCAT


DTM/Carnegie Geochemistry
WHOI Ion Probe Lab
Marc Spiegelman's Usercalc page (for calculating Spiegelman/Elliott U-series disequilibrium during partial melting. Caveat Emptor)
Bristol Isotope Geochemistry
Maryland Isotope Geochemistry Lab


Geoscience Departments WWW Directory - U.S. & Canada
European Geoscience Institutes (a list of web pages for most geoscience departments/institutes in Europe)


MARGINS
RIDGE2000


MELTS
Of course, our very own LEPR (Library of Experimental Phase Relations)
PETDB Rocks of the Ocean Floor
Georoc database (Mainz) Oceanic Island Basalts, Mantle Rocks, island arc rocks, and...
NAVDAT (Western North American Volcanic and intrusive rock database)
GERM (Geochemical Earth Reference Model) (and associated EarthRef.org pages)
Geokem (database of major and trace elements in igneous rocks)
PETROS Igneous Petrology Databank (database of major element chemical analyses of igneous rocks)
WHOI noble metal database
(Some of the links above are taken from the very useful PETDB Tools Page)

Here are some links of practical use to Experimental Petrology Labs: (no endorsements are implied)

Rockland Research (end-loaded piston cylinder and multi anvil devices)
Depths of the Earth (non-end-loaded piston cylinder devices)
Deltech (high temperature one atmosphere tube furnaces)
Buehler (grinding and polishing equipment)
Allied High-Tech (grinding and polishing equipment, cheaper than Buehler)
Daigger (general lab supplies)
VWR (general lab Supplies)
Matheson Tri-gas (supplies for setting up gas mixing apparatus)
Structure Probe Inc. (supplies for electron microscopy, a good source of those very delicate tweezers)
McMaster-Carr (tools, raw materials, the kitchen sink, etc.; if they don't sell it, it probably doesn't exist)
labequip.com (used lab equipment - balances, microscopes, ovens, etc.)

Other Interesting Stuff: (links to pages of links...how derivative!)

Join the ExPet Yahoo group (not run by us)
LPI's links for Planetary Science Web sites
U of Oregon page of worldwide microprobe labs and resources

Basaltic Volcanism on the Terrestrial Planets (an entire book online!)