We were setting up another SQL Server 2005 64-bit where we needed a linked server connection to our PostgreSQL 9.0 server. This is something we've done before so not new and something we documented in
Setting up PostgreSQL as a Linked Server in Microsoft SQL Server 64-bit.
What was different this time is that we decided to use the latest version of the new PostgreSQL 64-bit drivers now available main PostgreSQL site http://www.postgresql.org/ftp/odbc/versions/msi/.
Sadly these did not work for us. They seemed to work fine in our MS Access 2010 64-bit install, but when used via SQL Server, SQL Server would choke with a message:
Msg 7350, Level 16, State 2, Line 1 Cannot get the column information from OLE DB provider "MSDASQL"
If you tried to do a query with them. You can however see all the tables via the linked server tab.