I've been quite disappointed with the standardization of command-] for forward and command-[ as back for web browsers and the Jaguar help menu, as I enjoyed the quick keyboard access to the command-arrow keys (I have an older, smaller Apple keyboard from the original iMac days). Today I noticed holding down the option key while scrolling in Chimera will similarly move the current browser window forward or back through the history of visited pages.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020913053337694