Bruno's posted some stats. It's worth noting that we're doing some caching of these highly dynamic pages (each of the menu panels you see are constructed by queries on content, as well as the main content portion of the page). While serving 100,000 pages to 16,000 users on one day with caching of much content set to five minutes, the load on the two webservers was in the 0.3 range, while the database server was barely ticking over. We're only doing partial caching of dynamic content so we're pretty happy with the performance thus far. A modern dual-processor AMD-based system with DDR would outperform the Sun server, but we're doing OK with what we've got and Sun systems are extremely well-built, of course.
