I meant to comment on that 'drive shaft' post. I thought some 2006's might be affected too.
If you're concerned, your dealer can check your VIN against any campaigns that affect your car, and determine which were reported to be completed and which still need to be done.
Actually, anyone with Techinfo access can do this. Subscriptions are $10/day, I forget how much for a month of access, and something like $300 for a year. You can access tech info on any Toyota vehicle with a subscription.
for more info, try using this site's "search" feature to find older posts on the subject. or ask the poster (via email or private message or instant message or...) with the 2006 that you mention for more information about what they had done to their car...