This is a VERY small set of sites that might be of interest

Journals with MEMS content (only available to computers on the Brown University Campus)
bulletJournal of MicroElectroMechanical Systems
bulletSensors and Actuators A (Physical)
bulletSensors and Actuators B (Chemical)
bulletScience 
bulletNature
bulletPhysics Review Letters
bulletMicroscale Thermophysical Engineering
bulletSmallTimes (not a journal, more a trade magazine, but quite nice)

Some national MEMS resource centers
bulletMOSIS - custom designed chip fabrication
bulletMEMS Clearinghouse - tons of information about MEMS
bulletMEMS Exchange
bulletSemiconductor Subway (a road map based at MIT)
bulletMEMS Resources - trimmer.net
bulletBiological Sensors Group

MEMS Cad projets
bulletBerkeley Sugar (v2.0beta)  - local version
bulletCoventor (MEMCAD)
bulletIntellisense (Corning)

A select few research labs around the country (in no particular order)
bulletCarnegie Mellon
bulletBerkeley Sensors and Actuators Center (BSAC)
bulletU. of Michigan 
bulletCaltech Micromachining Lab
bulletMIT
bulletCenter for MicroElectronic Sensors and MEMS at the University of Cincinnati
bulletImperial College
bulletStanford Transducers (Kovaks group)
bulletStanford Microfluidics (Santiago group) 
bulletUniversity of Wisconsin (Beebe group)
bulletSandia National Labs
bulletGeorgia Tech (Allen group)
bulletCase Western Reserve

A few of the many companies with MEMS activities

bulletAnalog Devices
bulletCoventor (Simulation software)
bulletDraper Laboratories
bulletRedwood Microsystems
bulletCaliper Technology
bulletAclara Biosciences
bulletCepheid
bulletCronos Integrated Microsystems, Inc.
bulletIntegrated Sensing Systems Inc.(ISSYS)
bulletStandard Microsystems Corporation
bulletZyvex (MEMS and nanotechnology)
bulletIntellisense (Corning)

Some other useful links

bulletFundamental Physical Constants
bulletGeneral Chemistry Online
bulletUnit Conversions
bulletPeriodic Table
bulletMaterial properties