I would caution using Monolingual. I did use it once and got rid of all the languages I didn't use. Then when a new security update came up, I had problems with it. For example, no matter how many times I tried to update iChat, it just wouldn't update it. The problem was some component the security update was looking for and couldn't find because I had removed it. Though it's a lot of hassle, I'd either live with the foreign languages or re-install the system and then do a custom install only with the languages you use. That is what I did now with Leopard.