DimeCast.Net's SOLID principles video casts.
http://www.dimecasts.net/Casts/ByTag/SOLID%20Principle
Uncle Bob's blog on Ood.
http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod
I think this is the multi-part podcast on Model View * patterns which was mentioned last night:
Polymorphic Podcast - Design Patterns Bootcamp: Model View * Patterns