One Quickie

---

cd to directory with a space in its name (Unix->General)

There's two ways to do it. The first is to backslash-escape the spaces:
% cd /Users/bork/development/cool\ stuff/neat\ things

The other is to use shell completion to put in the backslashes for you. In the above path, if you type
% cd /Users/bork/development/cool[tab], it'll expand "cool stuff" for you.