Here they are:

1.      Dev315 - IronPython and Dynamic Languages on .NET

a.      mms://techedmsftwm.fplive.net/techedmsft/2007/DEV315.wmv

2.      Web324 - Dynamic Languages on the Web

a.      mms://techedmsftwm.fplive.net/techedmsft/2007/WEB324.wmv

thanks,
Mahesh