In addition to this weblog, I also maintain a list of security links at del.icio.us.  Although the list is for me to keep track of things I don't want to lose, other readers may also find it useful.  You can browse through my security items, which is further subdivited by category, such as security blogs.

If you haven't used del.icio.us before, give it a try.  It has recently been purchased by Yahoo!, and the reliability has improved quite a bit since.  If you use Firefox, there's a great del.icio.us extension for managing your items.  I'm hoping to see more features come out soon.