One Quickie

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Turning off incremental-search highlighting (emacs->General)

Emacs 21, which comes with Mac OS X 10.2, has highlighting enabled when doing incremental search (which drives me nuts). You can turn that off by setting this in your .emacs file:

(setq search-highlight nil)

You may also need to
(setq isearch-lazy-highlight nil)

To turn off underlining of matching results. Only some OS X installs need this setting.