Here are some great sites with information about various back related issues and injury prevention tips.
Spine-health publishes original articles written for patients by over 100 physician authors and peer-reviewed by a 17 member Medical Advisory Board. This trusted, independent site is supported by hundreds of physician members and visited by millions of patients and their physicians.
I think we’ve all been to WebMD at some point. They have decent information about common ailments and ways to keep your spine healthy.