I was annoyed that Vim moved all comments to the beginning of the line the moment I entered # sign. Searching around first turned me to smartindent, but I found that was already off.

Then this vimtip shed the light on the monster:
http://vim.wikia.com/wiki/Restoring_indent_after_typing_hash

just add to your .vimrc:

set cinkeys-=0#

And you are good to go.