Limit users to only one post per content type (D6)

It can be done using the Rules module (http://drupal.org/project/rules), which is a replacement for the core Triggers module.

First, give the authenticated users permissions to "edit own" posts of that type, but not to create them.

Then, define a role, let's call it "One Time Pass" and give it permission to "create content" of your content type and nothing else.

Assign this role automatically to all new users. (This can be done either with the autoassignrole module or with the rules module itself).

Then, use the rules module to define a triggered rule: When someone saves a node, if the node is of the specified type, and if the author has the "One Time Pass" role, then the "One Time Pass" role is removed from the author. So, the author can edit it (if you want) but can't create another.

solve, i believe, in d6 with:

http://drupal.org/project/create_quota

or

http://drupal.org/project/quota_by_role
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