Minimally maintained

PM Growl is a module that adds a simple ajax layer to private message module (http://www.drupal.org/project/privatemsg) and alerts you of new messages using the jQuery growl plugin (http://stanlemon.net/pages/jgrowl).

This allows for simple instant messaging type applications in the site, with an elegant pop-up in the screen.

Since there are far too many modules implementing partial functionality of this module, and the slow uptake (~30 users or 0.005% of Drupal sites), I have decided to declare the end of the road for rolekeys.

Here are some alternatives

To assign a role on registration try

Core actions can easily handle this
http://drupal.org/project/autoassignrole
http://drupal.org/project/registration_role

To allow a user to choose a role on registration
http://drupal.org/project/user_selectable_roles

To provide a role using a key during registration
http://drupal.org/project/regcode

Memberships (not covered by rolekeys!)
http://drupal.org/project/ubercart

To allow role assignment via "My account" area
http://drupal.org/project/autoassignrole

Also
http://drupal.org/project/og_joinrole
http://drupal.org/project/civimember_roles

Older modules
http://drupal.org/project/user_autorole (5.x)
http://drupal.org/project/rolesignup (5.x & unpublished)

Hopefully someone will be able to unify this mess.

Block Node Visibility enables configuration to show blocks on specific node types directly on the block edit form. Non-node type pages can be enabled via a callback.

This module shows users other nodes that they might be interested in based on a simple logic and using taxonomy.

It's a powerful module which enhance other modules functionality by personalizing form settings provided by them per user or per role.

This module alters the login form so it expects the User ID number instead of the user name
It also removes the necessity of usernames being unique.