--- a/.emacs-my	Sat Feb 04 23:11:04 2012 +0200
+++ b/.emacs-my	Mon Feb 20 13:08:16 2012 +0200
@@ -1309,7 +1309,7 @@
 )
 
 ;; Remove gnus-ignored-newsgroups to show all GMail folders.
-(setq gnus-ignored-newsgroups nil)
+(setq gnus-ignored-newsgroups "some-non-existing")
 
 ;; (require 'spam)
 ;; (setq gnus-spam-process-newsgroups