If you haven’t figured out how Mac OS X 10.5 (Leopard) help search box allows you to search menu items, check out Chris Pirillo demoing the feature.
The problem for me is that I’m a keyboard person. Over 90% of my day, I barely touch the mouse. Now, to get to the help search bar with your keyboard, just press:
⌘ (Command) + ⇧ (Shift) + ? (Question Mark)