Make all external links open in a new window. There are optional custom exclude/include filters.

"Allow users to register and login using only an email address. Users can then log-in using their email address and password for authentication."

"Elysia Cron extends Drupal standard cron, allowing a fine grain control over each task and several ways to add custom cron jobs to your site. "

"DraggableViews makes rows of a view "draggable" which means that they can be rearranged by Drag'n'Drop."

Firebug for Drupal themeing. See the screenshot and screencast, http://drupal.org/node/209561 . Note that this module injects markers into the DOM to do its magic. This may cause some themes to behave erratically and less capable browsers may make it worse (especially IE)/. Enable it when needed, and disable it afterwards.

"Internet Explorer implements a proprietary technology called Conditional Comments..."

Thanks to Dan Shumaker for this:

By default, MAMP error logs won't show up in the Mac console. (console.app). You can symlink them like this to make them show up:

Redirect users to different URIs