BMW Germany demonstrates why an enterprise approach to corporate optimisation (SEO) is the only one that makes any sense.  I wont even go into the details, Matt Cutts just says it all too well.

http://www.mattcutts.com/blog/ramping-up-on-international-webspam/

If you want to know more about enterprise SEO get a MAD.co.uk account and check out my Christmas 2005 e-newsletter.  I'll also try find out if they will allow me to republish it here.