When you get your renewal note from MSDN which you either already got or should get very soon, make sure you verify which SKU you would like to take and know that VSTESA 2005 is not the FULL version of the Team Tools, Team Suite is. There is plenty of debates and information out there on the the pricing scenario and upgrade paths please look at this great two part series from Rob Caron available
here and
here.
Also look here for a view of the various Team SKUs and what you are getting in each of them.
Finally my good friend Joel (from Canada) talks about an article he wrote for MSDN entitled A Lap around Team System you can read his post and follow the link to the article from his blog.