I like this whitepaper particularly because it talks about tuning, validating and benchmarking the storage system before laying down SQL Server on the disk.  It is nice to see a mention of the disk sector alignment benefits in a SQL document as this has been mentioned before but primarily for Exchange, of course these problems go away in Vista and Windows Server 2008 as the disk is aligned by 1024 as default. 

Katmai information is slowly making its way into the public domain.  There is a good webcast scheduled today.  Further info here: http://msevents.microsoft.com/cui/WebCastEventDetails.aspx?EventID=1032341071&EventCategory=2&culture=en-US&CountryCode=US

I almost missed this one.. SQL Server 2005 has received another update (May 2007) which can be downloaded here: http://www.microsoft.com/downloads/details.aspx?familyid=be6a2c5d-00df-4220-b133-29c1e0b6585f&displaylang=en - watch out, its 135mb! The updated BOL is also on MSDN :-)