Hi

What you use will all depend on what you want to achieve. From what you're saying it sounds to me that you need to set up an intranet with personalisation and an externally facing website with good SEO. In addition of course, both would need to be on the same platform and have the same CMS system.

What you also need to consider are whether now or in the future you're going to want to have social media functionality either for the employees as enterprise social networking (internal blogs, wikis, discussion forum etc.,) and social media marketing as part of the externally facing site.

Given all of this a shopping list might well include the applications listed by other posters including the open source CMS tools such as Drupal and Joomla and depending on the size of your operation Wordpress too, though I'm not sure how scalable it is. I'd also give the following a serious look too – SharePoint, SocialText, ThoughtFarmer, Clearspace Jive, and Lotus Connections. You might also want to consider a hybrid approach and many of these applications use tools (APIs) to talk to each other.

I'm looking at setting some of these up on a server in London which will be available globally as am E2.0 demo box. Please let me know if this is of interest so I can accelerate my plans here.

Russell

I forgot the links; here is seotoaster, the SEO CMS, and here is SEO Samba, the centralized web marketing software platform.