travelin_cat - 11:25 pm on Jan 27, 2010 (gmt 0)

Well, Joomla fits all of your requirements. Joomla.org has a very active community, and with a plug in like SH404, it has great SEO capabilities including elimination of duplicate content, built in 301's, highly configurable title, description and keyword tags.

And of course, there is the ability to have a multi-lingual site and many of the higher quality plug-ins support different languages.