One of the most frustrating things to deal with is trying to find technical information on a product, and running into marketing documents instead. Actually, I've run into the other situation as well - I want marketing information to back up some buying decisions or just for the graphics to present to the execs and all my resources are technical.
We've solved that issue here at SQL Server by breaking up our sites into four big areas for SQL Server:
Technical, DBA: http://technet.microsoft.com/en-us/sqlserver/default.aspx
Technical, Developer: http://msdn2.microsoft.com/en-us/sqlserver/default.aspx