This Drupal module will allow you to assign Page Titles by path instead of node.  It extends the nodewords_bypath module that allows you to add meta keywords and descriptions by path. 

This Drupal module will grab a user's Twitter feed and display it on your site.  The module will also allow you to manage:

Here at Avatar New York, we frequently use the open source Content Management System (CMS), Drupal, to build most of our content heavy websites.  In my opinion it's one of the best CMS's out there.  With that being said, it still has a few quirks.  One of my complaints is that it doesn't have a whole lot of SEO features built into the core (although it does provide for search engine friendly URL's via mod_rewrite).