Not intended as a non-answer, but have you considered _not_ advertising the database that’s backing your website?
Is it just me, or are “powered by” graphics best left to corporations touting their own products or to open-source advocates upping their geek factor (and simultaneously advertising open-source)?
I shy away from advertising the software I’m using, especially on a public website, as it gives hackers one less obvious indication of where to start hacking.
Besides, ever since “Slammer”, touting SQL Server as your db back end doesn’t exactly inspire confidence … unless you’re throwing down the gauntlet and showing just how stable and hackproof SQL+ASP.Net can be.
And I say all this as a SQL Server DBA.