How widely is Debian used for production?

[Nick Willson <nick@nickwillson.com>]

I am seeking help identifying installations that use Debian in production.  
Specifically, for database servers, and ideally for web sites that read from 
and write to a database.

To give some background, I've given some spare time help to a small company 
setting up a web site, helping them to install and use an Oracle database on 
Potato, so far just for development.  Naturally, I think Debian, as the 
'Universal Operating System', would be a good choice for eventual production 
use also, but there is some reluctance in the company.  If you know of 
installations or web sites that are using Debian in production, please let me 
know (or if you think Debian is *not* a good choice).

Thanks
-- 
Nick