Some quick links: Windows Sharepoint Services SP2 was made available last week:
http://www.microsoft.com/downloads/details.aspx?FamilyId=9C552114-DC9A-43EE-9281-B080B7C280B4&displaylang=en
and updated documentation is available here:
http://www.microsoft.com/downloads/details.aspx?FamilyID=a637eff6-8224-4b19-a6a4-3e33fa13d230&DisplayLang=en
Note: if you want to run Visual Studio Team Foundation Server (specifically Beta 3), with SQL Server 2005 (CTP16 - September) and WSS - I advise installing WSS SP1 from here:
http://www.microsoft.com/downloads/details.aspx?FamilyID=efdc7227-549c-4de1-a063-783f71a8bb2b&DisplayLang=en
On the "type of installation" page, select "Server Farm", as the TFS Beta 3 installer will configure and upgrade the WSS site to the relevant .NET 2.0 Framework and configure SQL Server 2005 databases as required.