A good "About" dialog

Question

Background: I have an application that is licensed under the LGPL which uses a whole bunch of open-source 3rd party libraries.

What kind of information should I have in my "About" dialog box. There are a few things I can think off the top:

• Author(s) of this application
• Copyright/Licensing information
• Credits

Is there anything else that should be in an About dialog?

Answer 1

a good about dialog should have an easter egg :-)

Answer 2

• Home page (as a link if your UI framework can do it)
• Version information of both your app and the libraries you're using
• Support information (e.g. how you like bugs to be filed)

Answer 3

Expected:

• Name of your application
• Versionnumber
• Icon of your application

Optional:

• Link to the website
• About the developer (+email link)