Service pack 1 is now available, just click on windows update to download it.
Been out about a month. If you have your machine set up to Update automatically as one should, it will have downloaded on or around the 9th of March.
I heard from someone else that there are a few bugs in it and microsoft are releasing service pack 2 soon!
MS are working on SP2 but it wont deliver till mid next year. Any bugs in SP1 will be patched by hotfixes!