Some time ago, I saw mention of a new book series from O'Reilly called Head First. They published a chapter of the Head First Design Patterns book on the O'Reilly network and I found it particularly intriguing.
Since then, I've had a chance to start reading the weblog that is tied in with the book series, Creating Passionate Users. I'm loving it. Titles such as "You 2.0" are inspiring and a great reminder that it's never too late. And the general theories on how people learn are well worth consideration.
I finally got around to ordering the Design Patterns book, too. I'm just looking forward to O'Reilly doing the .NET technologies in the Head First series.
Update: I was reminded (in a rather long, twisted way (way to go, Michael 
)) of another similar blog: Church of the Customer. Some really good bits on successful business practices and word-of-mouth marketing.