Plugin for page-restriction for non-members?

You mean besides the ability to add a password to each post? Do you know about that feature already, or you want something more advanced for blocking non-registered users?

There is a plugin which restricts some of your static pages to members. But you have to modify te code if you use WordPress 2.1 or 2.2
Search for it at www.ads-software.com dokumentation.

https://17thdegree.com/archives/2005/07/01/wordPress-plugin-page-restriction/