Virus Bulletin 2008 Slides -
http://www.virusbtn.com/conference/vb2008/slides/index
ToorCon X Presentations -
http://security4all.blogspot.com/2008/11/toorcon-x-presentations-online-plus.html
OWASP 2008 Videos -
http://www.owasp.org/index.php/OWASP_NYC_AppSec_2008_Conference
HITB Slides -
http://conference.hitb.org/hitbsecconf2008kl/materials/