Scuba Central
Exactly what it sounds like - a center for diving-related material.

Over 2,000 links and plenty of other material. Ugly,

but warmly recommended.
http://www.scubacentral.com/

Cave Divers Corner
Everything you need to know about cave diving.
http://grove.ufl.edu/~ken/cavers.html

Yahoo
Yahoo, naturally, includes an extensive collection of diving-related links.
http://www.yahoo.com/Recreation/Out...

Dyksidan

http://hem2.passagen.se/dyksidan/

dykkesiden.com

http://www.dykkesiden.com