Some interesting shell commands

zipinfo
sips
curl 

-- these are pretty useful for folks who make a living pushing image files around (especially to and from remote servers).

And as I get more comfortable with the shell, I find I totally avoid using Spotlight or command-F and go right to

find

instead. I feel like it's faster, maybe partly because of that insane find-as-you-type behavior in Spotlight. Also, if I'm trying to page through a couple of gigs of stuff on the server, it's nice not to bog down the Finder while the search goes on. Of course, I don't actually live in the Finder much; jumping into the shell wouldn't be nearly as convenient if I weren't using Path Finder instead. The drop down Terminal pane is killer.