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Fluid web designs have many benefits, but only if implemented correctly. With proper technique, a design can be seen correctly on large screens, small screens and even tiny PDA screens. With bad coding structure, however, a fluid layout can be disastrous. Because of this, we need to find ways to work around most, if not all, of the cons of fluid design.

Allows you to allow select user roles to administer individual menus or menu items.
Quick Start:

IdeaTorrent is what can be defined as an "open innovation software": it lets people submit their ideas, brainstorm them, and vote on them. The most popular ideas and requests are then easily assessable.
That's a very interesting mean for a project to have an insight on the demands of his user base!

One of the biggest live example is http://brainstorm.ubuntu.com.

Allow users to register using only an email address, ie. without username. The user, once registered then may log-in using their email address and password for authentication.

A username is generated and assigned based on the user name part of the email address. Subsequent users who have the same name (email prefix) are numbered sequentially. For example, "johndoe@exampleA.com" would be assigned username "johndoe", "johndoe@exampleB.com" would be assigned "johndoe001" and so forth.

The permissions_api module provides a method for granting and revoking permissions for a given role. This module helps with the issue of staging a Drupal site across multiple environments, from development sandbox to production environment.

Allows roles to inherit permissions from other roles.

[BM: This answers a need I wrote about that isn't quite filled by permission select module. Can't find where I wrote about it, so noting it here.]

Allows drag'n'drop placement of Imagefield/Imagecache images into nodes by providing a "Place images" local task right beside the normal "Edit" link of a node. For the moment it is limited to floating left and right and getting placed to the top or bottom of the node's body, inserting into paragraphs will be coming soon.