Important - Vista Users If you get an update notice for SP1 (it's a preliminary update to prepare your machine for the full sp1 update) DON'T install it! It's been causing lots of crashes and MS have actually now recalled it So I imagine SP1 will have some big delays I've turned off my auto updates
http://www.pcadvisor.co.uk/news/index.cfm?newsid=12199 apparently this is only for x64 versions anyway