Pingdom has the results of a survey they did with seven websites (including TechCrunch) that shows certain trends on back end software. Almost all use Linux, Apache (with Lightly coming on strong), MySQL, and PHP.
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I’m actually surprised you’re just on 2 servers Mike. I would have thought you’d be on at least 5 (2 web, 2 DB and one “other” for things like crunching stats and mail).
Dunno, given your revenue I’d have just thought uptime would be of fair importance to you (ie: this isn’t a jab, just surprised).
Jeremy: number of servers alone isn’t a measure of redundancy or performance
It looks like PHP and MYsql are the clear winners. Personaly I think NET looks v MS centric.