The IBM Software Architect Kit is a nice set of goodies that introduces the world of software architecture.
Grady Booch takes you through a series of podcasts that explains the past, present and future with a set of documentation that covers the world of software architecture according to IBM at reasonable high level.
As I've said before I'm not really a raving fan of Grady Booch but I respect his massive contribution to the discipline.
You will require an IBM ID to access the kit.