Well I'll have to say that our CMS Halogy can do this very well. It's currently handling over 5000 users for a project management site, and we have another site

Well I'll have to say that our CMS Halogy can do this very well. It's currently handling over 5000 users for a project management site, and we have another site that houses over 7000 users for an online shopping community. It does all the 'normal CMS stuff' too (like Blog, Editing, version control etc). http://www.halogy.com http://www.halogy.com