SQL Server 2005 webcasts page
There'll be a whole slew of 2005 content starting up late this year, beginning with the webcasts that Kent mentioned. There's a page where all of the 2005 webcasts will be aggregated on the SQL Server dev center, at http://msdn.microsoft.com/SQL/2005Webcasts/default.aspx. You can use that as an easy one-stop shop for both upcoming and (once they've aired) on-demand access to this content.
I've also put a SQL 2005 labs page up as well, at http://msdn.microsoft.com/SQL/Labs/default.aspx. Right now, you can only get the manuals here; the labs themselves can be obtained on the Beta 2 Resource Kit DVD. I'm hoping to get links to downloadable labs up within a month or so, though. I'll post something when that finally happens, as I think those will be a great resource.