Be careful with all of this...I used Monolingual and freed up over 2 gigs on Leopard (I made sure the options for not deleting architectures were checked.) The next time I restarted my mac, the grey startup screen hung indefinitely. I ended up having to wipe the HD and start over from scratch. I'm not sure if it was a fluke or Monolingual was to blame, but I'm just offering a 'heads up' to others considering doing this.