"What security people won't share with each other"
Scott Blake has a really interesting 3-part podcast interview with Mike Murray. See Mike’s post, “it never ceases to amaze me what security people won’t share with each other” [link to http://www.episteme.ca/index.php?/archives/207-Scott-Blake-It-never-ceases-to-amaze-me-what-security-people-wont-share-with-each-other.html no longer works], and go understand why you should give Scott a demerit.
(I’d meant to post this months ago, when Scott did the interview. Oops!)