A colleague of mine (thanks Jimbo!) pointed me towards a benchmark comparison of Postgres 8.3.8 on RHEL 5.4 versus SQL Server 2008 R2 on Windows Server 2008 R2, performed and written up by Red Hat. I hadn't seen it before, so figured that maybe others hadn't either:
Can't wait for the result? The elephant wins :-)
Dave has been actively involved in the PostgreSQL Project since 1998, as the lead developer of pgAdmin, maintainer of the PostgreSQL installers and one of the projects resident Windows hackers. He also serves on the project's web and sysadmin teams and is a member of the PostgreSQL Core Team. Dave is employed by EnterpriseDB where he works as a software architect and developer on EnterpriseDB products in addition to his community PostgreSQL work.