Where do I start?  What kind of lighting do I need?  Is this fish reef-safe?  Why do I have this algae in my tank?  What IS this thing?  When Don & I started reefing, there really was no internet to speak of.  Home PC's were pretty much unheard of. 
Good literature was hard to find.  We were basically stuck with the advice of the local fish-store, and trial and error. 
Here, I hope to outline a few of the best places to get help online - the best forums, and other helpful sites.
 
Online Forums
 Reef Sanctuary
I was finally able to realize my dream of owning and creating an online reef forum.  The site is small, but growing rapidly.  It was started in November of 2003, and is the 'home' of hundreds of experienced and helpful 'reefers'.  ReefSanctuary also contains an excellent research section.
The site is owned and run by myself and my partner, Travis.  You'll find me there as "ReefLady". 
 Hope to see you there!
 Aquarium Advice
Another great SW & reef online forum.
Also includes freshwater forums.
 ReefCentral
Probably the largest online reefing forum.  In my experience, not the "friendliest", but worth a stop to use the search function if you're totally stumped.
 Reefs.org
Similar to ReefCentral
What is this?  The best sites to ID the critter that just appeared in your tank.
 Hitchhiker FAQ for the Reef Aquarist
Priceless.  Almost all hitchhiker's can be ID'd using this site.
 Odd Critters - by Dr. Ronald L. Shimek, Ph.D.
A great ID place for the little less common. 
Comb jellies, hydroids, limpets, and more.
 Rogue's Gallery - Dr. Ronald L. Shimek, Ph.D.
The "dangerous" (or at least pesky) stuff.
Aiptasia, Mantis, flatworms and more.
 The Key to it all...A Dichotomous Key to The Animals Likely to Be Found in a Coral Reef Aquarium Live Sand Bed .
A great key to almost all live organisms that can be found in a DSB. 
 ReefImages.com
Simply one of the best photo ID sites in existence.
 Aquarium Arts - Reef Invertebrates & Fish
Picture ID of some of the more common reef inhabitants - common names included.
 The John Rice Reef Page
Can't find it?  Try here.  This guy has a great page, and lots of pictures of inverts, oddities, algae, etc.

 
 
Other helpful sites....
 Aquarium Frontiers Article Index
From biochemistry to coral spawning, not much you can't find here.
 DefLizard's Web Site
A great all-around site.  John knows more about fish than almost anyone I know.  A very helpful person!
 Fish and Coral Index (Actwin)
Excellent information - all kinds! 
From Identification to DIY.
 OZ Reef
Another all-around excellent site.
 Reefkeeping 101 - Reefcorner.com
Starting out?  A great place to begin.
 WetWebMedia.com
Hosted by Robert Fenner, author of "The Conscientious Marine Aquarist".  A fantastic site about the creatures we keep.

 
 
Online Publications....
 Advanced Aquarist Online Magazine
A new issue monthly, with several excellent articles. 
Completely free.  An excellent publication. 
 Reefkeeping.com
Another excellent (and free) online reef publication.

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