www.advancedaquarist.com  - great online resource

reefkeeping.com/issues/2008-01/tips/index.php - great online resource to search, this one is a recommended library

www.reefbuilders.com  - another great online resource

archive.reefcentral.com/forums/showthread.php?s=&threadid=102605 - everything reef chemistry

www.reefcentral.com - excellent forum w/ tons of great info and a poor search engine

www.reef2reef.com - good forum with tons of vendor updates - high end sps sellers such as BiG-D

www.chicagoreefs.com - chicago reefing forum

www.kenargo.com - great reference for Neptune programming and general info

www.reeftronics.net - another great Neptune reference

www.glassreef.com - great site with DIY info including overflows and many more

www.beananimal.com - site and build info for the silent failsafe overflow

www.melevsreef.com - great DIY, Acrylic, Reef Identification, and so much more

www.coralsee.org - Acro ID

coral.aims.gov.au/speciesPages - coral ID

www.zeovit.com/forums/forumdisplay.php?f=98 - sps id

www.chucksaddiction.com/CoralGenus.html - coral genus ID

rickysreef.blogspot.com/2009/09/ora-corals.html - ORA coral ID

Online little known, but good Equipment stores;

www.kensfish.com

Online Coral,fish,invert stores

www.liveaquaria.com
www.pacificeastaquaculture.com
www.happycoral.com
www.battlecorals.com
www.rockymountainfrags.com
www.wtsps.net
www.lbacorals.com
www.addictingcorals.com
www.cherrycorals.com
www.exoticfrags.us
www.extremecorals.com
www.coralprops.com
www.uniquecorals.com
www.pacificislandaquatics.com
www.mrcoral.com
www.bluezooaquatics.com
www.saltyunderground.com
www.aquasd.com
www.worldwidecorals.com
www.vividaquarium.com -horrible- they dropped a wysiwyg clam during packaging cracking its shell, 
                                                               shipped it to me anyway w/o telling my they dropped it. 
                                                               It arrived and died in 2 days. Same order they also broke a wysiwyg
                                                               sps colony, again did not tell me. They simplly shipped the order and
                                                               watied for me to contact them about the problems.