Your Sports Information Director should be able to help out in posting summer workouts online. We did that for last summer, I brought up the idea to our SID and he just told me to send him the workouts and he would take care of it, as far as making password protected, and having each sport find there own specific workout he took care of it and did a great job, and it worked out great. The only thing with instruction on technique I referred them to websites that had video demos of exercises. I know Air Force and UCLA have great demo videos on there strength and conditioning website and I used them a lot as references if any of my athletes had questions. I'm in the process of trying to post our exercises on our site, that way I don't have to refer them to other sites.
I've been distributing summer manuals on CD-ROM for the last 10 years. At the time I switched, our manual was costing over $10 to print. I can produce it on CD for less than $1. We have our entire manual, plus video clips of most the exercises and drills the athletes would be performing in the summer. The CD features an auto run command that opens up the disc to a Table of Contents page. Athletes can then navigate through the manual from the TOC page.
Best of luck,