Although Elitetrack is the best source on the net for training and conditioning related info there are plenty of other great resources out there that get the Elitetrack seal of approval of being science-based, coach proven techniques and training related advice. Here's a couple of my faves:
Peak Performance from Runner's World – This blog of sorts provides daily entries usually providing quick reviews of peer-reviewed research. A good quick and dirty read.
PubMed – The online resource for checking out article abstracts. If you know the tricks of using it, it can be an incredible resource. Be sure to not be a research troll though and only read the abstracts as they very rarely tell the entire story…and it can make you look like a buffoon if you speak about research findings and you don't know the entire story. If you find something interesting, controversial, or thought provoking go and find the full article.
Journal of Sports Science and Medicine – A free online journal with some pretty good articles. It's rare (other than Elitetrack of course!) to find free sports science articles in their full format.
If you've got some resources you'd like to share please add them to the discussion.