Forum Moderators: Robert Charlton & goodroi
I have some experience with this just last year -- although not quite so many pages at once. Still, the proprtions of new to established urls were about the same. And the result was solid traffic from google.de to the German pages, etc.
I'd also suggest doing the language-selection code in Javascript, so that Googlebot doesn't see a vast network of cross-links.
[edited by: cabbie at 6:59 am (utc) on Aug. 24, 2006]