Have a look at this one
<b><a href=”http://www.youtube.com/watch?v=J88X_M6s0l4&feature=related”>Storage Area Networks (SANs) 101</a></b>
Titled SAN 101 and lasts for 40 minutes. The guy seems to know what he is talking about
If you then look on the right-hand side there are links to many more videos on the subject.
I would also recommend to read this IBM redbook:
<a href=”http://www.redbooks.ibm.com/abstracts/sg245470.html”>Introduction to Storage Area Networks</a>
Another good one: <a href=”http://video.yahoo.com/watch/2878805/8268150″> SAN Questions </a>