"Users will be be able to filter their entries according to their security settings by appending the argument security=friends, security=public, security=friends or security=customgroupname to their journal URLs. Style System 1 users will see filtered pages in the style that is used to display their tag pages and not in their own styles."
YES FINALLY
When this is implemented I will be thrilled. I have wanted this feature forever, the ability to see what posts I posted within a certain filter. Now that I actually use tags, if I am careful to tag entries as I make posts to custom filters, I can use that to gain sort of the same effect, but, for example, I don't tag my posts locked only to friends-in-general as "friends", so I don't currently have an easy way to display only those posts when looking at my own journal. Security=public will be useful too -- right now what I have to do if I want to see what my journal looks like to someone I don't have friended is to either log out, or open Internet Explorer (where I am never logged in anyway).
yaytastic!