There are a ton of webcasts available coming in April.
WebCast Series for Developers - http://blogs.msdn.com/msdnwebcasts/archive/2005/03/16/396417.aspx
Some that are already available:
Essential ASP.NET (Fritz Onion webcasts) - http://www.microsoft.com/events/series/essentialaspnet.mspx
This is a series of 15 webcasts.
ASP.NET (Intro, Intermediate, and advanced webcasts) - http://www.microsoft.com/events/series/msdnaspnetoct.mspx
I will be adding the WebCast RSS to my online aggregator.