1. The equivalent of a Meta-backspace on Linux that deletes a complete word on the command-line.
2. How to tab between two xterm windows on the current virtual desktop without being moved to a different virtual desktop if you have more than two applications in total open (say Safari, Xcode, etc).
3. How to put virtual desktops in a grid.
I hope this isn't too much to ask for.
As for "I hope this isn't too much to ask for", when I first got a Mac I asked on a forum how to maximize a window fully (as many windows resize to the window contents rather than full screen - not necessarily a bad feature but I also wished for a 'proper' maximize). I was perfectly polite but was flamed to death and told to "go back to Windows" (even though I had come from Linux). The community can be a little.. tense.. when you ask for features that don't exist.
2. Type in a terminal:
defaults write com.apple.Dock workspaces-auto-swoosh -bool NO
3. They say there's an app called Secrets that lets you play with such config stuff.