Well, I was able to download SQL Server 2008 R2 today so it looks like the whole stack is now available on MSDN.  One important note is if you are downloading from MSDN, you might find that SharePoint Designer 2010 is not available.  This is now a free product so I guess it is why Microsoft put it in a different location.

To download SharePoint Designer 2010, go to http://microsoft.com/downloads and search for them.  Here are the current working links as I found them today:

SharePoint Designer 2010 32-bit Edition:
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=d88a1505-849b-4587-b854-a7054ee28d66

SharePoint Designer 2010 64-bit Edition:

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=566d3f55-77a5-4298-bb9c-f55f096b125d

-Bill