As I mentioned in my last blog post, SQL Server is updated several times a year - our team calls this a "web refresh". Isn't it great that we come up with new words to describe things? Anyway, SQL Server Service Pack 2 just released, and Books Online must be updated right after you finish the SP2 install: Get the new Books Online here.
As an aside, the README for this release is pretty huge, and has a lot of information about Vista and SQL Server in it. Make sure you read through that as well.
(Podcast Attached, click title above to access file if you're in the default view)