By John Gruber
Mux — Video for developers
Another terrific in-depth article from Doug Bowman, this time explaining how to use SSH tunnels for secure access to email over insecure networks (like, say, Wi-Fi). (I use SSH tunneling not just for email, but for posting to Movable Type with MarsEdit as well.)
Tom Yager has an interesting tip:
When I use my PowerBook in dark spaces like conference sessions, I find that even the dimmest backlight setting is too bright. Control-Option-Command-8 switches the display to greyscale, then inverts it (in other words, black text on white becomes white text on black). The light output falls by half or more. It looks strange — the Dock icons are a really a trip in negative grayscale — but the entire GUI is perfectly usable.
(Via Nat Irons, via email.)
Check out the keyboard shortcuts.