vim - stop autoindent while pasting text

On a putty terminal, when you copy-paste code from other sources, it results in a complete mess, due to vim trying to format it again. To avoid this, type

:set pastetoggle=

Now you can use to toggle between paste mode (and no paste mode).

When in paste-mode auto indent will be turned off. This is very useful when pasting text that's already indented.

source:
http://amix.dk/blog/viewEntry/19083