NSFW allows you to send a shortened and safer URL which are Not-Safe-For-Work with a warning that the content/link outgoing onwards is NOT-SAFE-FOR-WORK. That's it -- plain and simple.
Twhirl is a popular desktop Twitter client, based on the Adobe AIR platform, developed by Marco Kaiser. Besides being able to acess Twitter service directly from the Desktop, Twhirl also cross post to other services like Pownce and Jaiku.
Flash has come a long way since the dawn of the unfortunate "skip intro" phenomena that swept the web in the late 90's. ActionScript 3.0 is now able to do things never thought possible on the web.
The security model for the HTML application sandbox in AIR varies significantly from the sandbox available in the browser. The reason behind this is there are a number of design and implementation patterns common to HTML web applications that are too dangerous to be combined with the local system access inherent in the AIR application sandbox.