I suspect this will be pretty widely advertised fairly quickly, but both Visual Studio 2008 SP1 and .NET 3.5 SP1 are available for download. Personally I’ve had problems signing into the MSDN subscriptions site and going to the downloads page, but the direct links work fine. Both are fairly small files which then download more stuff when you execute them. The .NET 3.5 SP1 download doesn’t require you to have .NET 3.5 installed beforehand.
Update (13th August): Patrick Smacchia has a great post showing the differences (in terms of numbers rather than features) between 3.5 and 3.5SP1.
Jon Skeet's coding blog 
You can also get the full packages for each service pack — the download links are near the bottom of each page.
Also, you need to download the SP1 update for the MSDN Library separately, probably because it’s a whopping 2.2 GB:
http://www.microsoft.com/downloads/details.aspx?FamilyID=7bbe5eda-5062-4ebb-83c7-d3c5ff92a373
And don’t forget to run the beta cleanup utility first if you had SP1 Beta installed:
http://www.microsoft.com/downloads/details.aspx?FamilyId=A494B0E0-EB07-4FF1-A21C-A4663E456D9D
LikeLike
And Ayende Rahien has a post showing (some of the) problems introduced by the Service Pack…
http://www.ayende.com/Blog/archive/2008/08/15/Waiting-for-the-Service-Pack-I-dont-think-so.aspx
(Per Brad Adams and Jon Langdon, the CLR team is working on the issues. But – wow!)
LikeLike