Adding descriptions to blocks in the user edit form

I've created a module to add descriptions to the blocks visibility fieldset in the user edit form. Now it's possible to set a description for each block and show them to the users, when they whant to show or hide blocks in the site. I've included images of the module in action.

It's a very small module not having any database interaction (information is kept in a drupal variable). For now I've only created the 6.x-1.x-dev release, I don't know if anyone is interested in a 5.x version.

The project is http://drupal.org/project/block_descriptions