This article details the Top 10 Pro Recording Resources on the Internet.
This informative article gives some very helpful information on what to do before you press record.
Theproaudiofiles.com is a great pro recording website with a large variety of very educational articles that will help you become a better music producer.
The 5 Minutes to a Better Mix series are worth the click alone.
prosoundweb.com is one of the most well respected pro recording resources around.
soundonsound.com is, with prosoundweb.com, one of the most well respected sites dedicated to pro recording on the Internet
This online course offered by Berklee College and taught by Loudon Stearns is an extremely educational look at the concepts and techniques of professional audio recording.
Another online course, this time from Emory University, teaches the principles of digital sound design. Practically essential if you want to learn the art of digitally manipulating sound.
This article on hometracked.com gives some very insightful lessons on how to turn your amateur recordings into pro recordings.
The Recording.org forums are a great place to start for anyone wishing to learn more about pro recording. This is a great resource for everyone from beginner to expert.
This blog post on the Ultimate Guitar forums is a very informative and educational article on what to expect as a pro recording engineer.