Interesting site/blog about logo design:

http://www.logodesignlove.com/

Specifically, a very interesting post about logo design:

http://www.logodesignlove.com/logos-are-dead

A free chapter from their book (including brainstorming, mind mapping, etc.):

http://www.logodesignlove.com/free-logo-design-love-book-chapter

[posted by neal]