Couple of things from the top of my head:

M-x rgrep recursive grep. Very useful for coding in general.

M-x compile also works for perl programs, with error file/line navigation, like rgrep.

Sepia is pretty cool.

Version control: psvn (M-x svn-status) is good for SVN. GIT's own git.el is OK, but there might be something better.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: Favorite Hacks in Emacs by Joost
in thread Favorite Hacks in Emacs by jaschwartz

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