In no particular order, here's a bunch of links I find useful or fun:
clrscode Package
for LaTeX2e: This package allows you to typeset pseudocode the way
CLR[S] do in Introduction to Algorithms.
Equation Editor for
Keynote. Enter a LaTeX equation, click a button, and the result is ready to drag &
drop into Keynote! You can even set the font colour and size.