Managing with Vundle: plugin isn't loaded

I installed this project using Vundle, as suggested in the installation instructions. However, I don't get syntax highlighting in .info files, and CTRL-N autocompleting only completes based on e.g. function names in the current file. Also, if I introduce an obvious syntax error into e.g. the filetype.vim that comes with the plugin, Vim doesn't complain. In short, I don't think the plugin is being loaded!

Here's my .vimrc: as you can see, I've got two bundles managed by Vundle; this is a good test of Vundle generally, as command-t works fine, so it should all be OK.

" To get command-t to work - see below
:let mapleader = "-"

" Recommended by Drupal vimrc project
set nocompatible
filetype plugin on
  
" Vundle config
" This line recommended by Vundle but could it be conflicting with the above?
" filetype off
set rtp+=~/.vim/bundle/vundle/
call vundle#rc()
  
" Vundles
Bundle 'gmarik/vundle'
" My bundles here
Bundle 'git://git.wincent.com/command-t.git'
Bundle 'git://drupalcode.org/project/vimrc.git', {'rtp': 'bundle/vim-plugin-for-drupal/'}

Any ideas?