Todd Lammle didn't write his book in several languages, other people translated his work to other languages..
anyway, allowing members to post in non English is ok in my point of view, but having the whole site available in other languages, that is what i don't think is easy or logic now.
Take this thread as an example, the guy asked a simple question but no one replied him why? i think because no one knows what the title says or may be no one knew the answer..
I'm not against having the site open for non English members, I just say we as "end users" can solve language issue easly by using one of the online translators.
Finally, I think as an IT person English language is necessary to survive and to develop.
Cheers,
always Face your Fears...