a few things aren't obvious to me after a half an hour evaluation. First impressions of v2.0 so far have been great (aside from a little hiccup with a cross pollinated $_REQUEST call...), and the new tutorials that were missing several months ago make all the difference. However, I cannot find anything related to content access restriction, or how to implement it. The Security tab doesn't seem to be related to content so much as functionality.
How do I a) restrict access to my content and b) allow people to register for my site so I can then grant them access?