iChat

Screen lightness setting
http://www.ecamm.com/mac/iglasses/

Issues:
http://www.technologyevangelist.com/2007/02/ichat_av_the_best_un.html

Alternatives:
Skype, http://www.sightspeed.com/

Printer settings Mac OS X

http://www.45rpmsoftware.com/45RPM/Locamatic.html

http://www.macosxhints.com/article.php?story=20060122060330816&lsrc=osxh

http://www.macosxhints.com/article.php?story=2005010613401823

http://tech.inhelsinki.nl/locationchanger/

http://www.codepoetry.net/projects/cups-pdf-for-mosx