Features and usage are summarized on the homepage.

Run http://gist.github.com/323731 and afterwards, install Xcode.

Indeed, you can. Refer to our complete installation instructions.

Alright then… as long as you know what you are doing:

sudo chown -R $USER /usr/local curl -Lsf http://github.com/mxcl/homebrew/tarball/master | tar xvz -C/usr/local --strip 1 

The wiki is your friend.

I'm Max Howell and I'm a splendid chap.