Thank you Kafkaesqui, that looks just right answer to my need. I installed it and had a look on role management: Great!
But… after installing this plugin I get blank page when I try post. If I deactivate plugin, I can post again. Can you or anyone help with this? I really would aprreciate it. My WP is 2.0.5.
EDIT: Of course I have given my role permission to post all categories.
EDIT2: Actually it is not role management that causes blank page but Limit Categories.