Not sure if this is of any use but here goes anyway ... clicking the green "maximize" button in Calculator cycles through the Basic, Scientific, and Programmer views.
[robg adds: Here's yet another non-standard maximize button behavior. Apparently, this behavior has changed sometime between December 2002 and today; back then, the green button created a tiny calculator window. That mode has apparently vanished, and now the green button is a shortcut for the modes shown in the View menu.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20060622153101135