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Their main site is down. Anyone want to enlighten the rest of us about what OpenX is? Something about ads, it seems; can anyone be more specific?

It's an open source ad server.

Fair enough; in that case, why would I use it instead of (say) nginx? Is it an optimization thing or a logging thing?

It is a complete web application to manage ads, something like Wordpress for ads.

Slight misunderstanding. It's a PHP webapp that is an ad server. Not a web server. Having seen the codebase... it's evil.