Filters the Context module's drag & drop selection menu when using the Admin module. This module uses the context module's preprocessor functions to limit the options listed in the drop down.
Context filter also provides the ability to mark regions as not editable, which can be used to prevent, that users drags blocks into unwanted regions (e.g menu, header).
You can rename the groups displayed in the drop-down to more meaningful names to end users (normally the groups are named after the modules that provides a given set of blocks).
Drupal 7 improvements
This version of the module enables administrators to limit the options in the drop down list and rename the groups (modules names) into things that makes more sense for a given site.
New
This version also enables users to toggle empty regions from a link in the short-cut bar introduced in Drupal 7. It furthermore adds a create context link in the bar as well, which can be used to create a context for the current page.
You should use this module together with Context in-line editor to be able to drag & drop blocks unto the site base on contexts.
Have you ever encountered a scenario when you have content for which you are setting view permissions and you find you would love to require your users to have two of your existing roles to view it? By default Drupal will allow users with either of those two roles to view the content, and your only recourse is to find a module like Taxonomy Access Control to control your access from a separate location, or to create a 3rd role and require it to view the content (and then assign that 3rd role to untold numbers of users).
Access Join solves that problem! With either blocks or nodes (node usage requires the Content Access module) you can select a group of roles and with the flip of a radio selector change that content to require all the selected roles for access!
Access Join essentially allows the 'AND-ing' of roles together when setting which roles can view content. Drupal's default behavior is to use OR when looking up which roles have access to content. The module works for blocks and (with a very small core hack) nodes.
IP address manager records user IP addresses, and allows admins to view which IP addresses have been tracked against a user, and which users have been known to use a certain IP address. This can be currently used to identify duplicate accounts.