I'm assuming you're talking about pen-testing and not programming specifically. If that's the case, check out irongeek.com. He has some good tutorials.
<a href="http://irongeek.com/i.php?page=security/hackingillustrated" rel="nofollow">http://irongeek.com/i.php?page=security/hackingillustrated</a><p>Also, you might want to consider watching some of the presentations from defcon 15.
<a href="http://www.roysac.com/blog/2007/09/defcon-15-session-and-panel-videos.html" rel="nofollow">http://www.roysac.com/blog/2007/09/defcon-15-session-and-pan...</a><p>I hope that helps.