Useful for long web pages: Cmd + Up/Down (from here)
Start-up key combinations for Intel Macs
I knew a few of these but what I was looking for was the C key on boot to boot from an external drive:
Syncing multiple Dropbox accounts from the same Mac
Perfect – this is exactly what I was looking for. I didn’t follow the instructions as far as adding the two scripts to my Logon items, but creating the two Automator scripts that I can run when needed was exactly what I was looking for.
Re-enabling screen zoom after installing Mountain Lion
Go to System Preferences, Accessibility, click on Zoom – ‘Use scroll gesture with modifier key’ option is deselected. Select it, and chose your key to enable the feature.