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Main feature is that it provides a dashboard for developers, allowing to flush a set of caches very quickly (form, locale, theme, autoload, file registry, views, etc..) one by one or grouped.
Another quite interesting feature is that all the developer's function access respond to a encrypted (secure? If not, please tell me!) cookie that only people with a specific permission can acquire: this means that you can browse your site with any user account without it being altered and still be able to access developer functions.
It provides a themable menu bar (displayed at the bottom of the screen per default) which allows a quick access to most functions of the module.
This bar will show up with no buttons for everyone as soon as the module is enabled (this is meant for development environments) containing only the environment name (machine name per default or manually set if desired).
Most of the functions are quickly reachable in this bar as soon as you have the developper access (the magic cookie) independently on the user logged in.
The bar embeds a quick user masquerading feature, which allows you to come and go from to any user account quickly, allowing you to retrieve your original identity from the magic cookie.