Intellisense really does have a mind of its own. I installed SQL 2008 R2 on my dev machine side by side with my existing 2005 installation and Intellisense worked fine. Granted it has some really annoying habits. (Dude, I typed a valid keyword followed...
The developers of Management Studio and, before that, Query Analyzer have made a bit of a habit of building killer features and then hiding them in the small print of Books Online. Now you may already know that SQL 2000 introduced a new way to arrange...