I must make site where users are adding their own categories (with additional fields) and then use these categories at sending new nodes, additionally I must have the block with categories of the user which are acting as the filter showing nodes only from the given category. There is some module what allows to add new fields to the category? I can do the rest with the help of CCK and Views. Or there is other solution ?

"Nodeblock" and "Nodes in block" are not the solution.

Best Regards,
Chris.