Wikipedia which ran a mixed of Red Hat and Fedora Linux servers are chosen Ubuntu Linux.
Wikipedia adopts Ubuntu for its server infrastructure
The Wikimedia Foundation, the organization behind the user-driven Wikipedia project, is in the process of migrating its servers to the Ubuntu Linux distribution. Wikimedia’s move to Ubuntu is part of an effort to simplify administration of the organization’s 400 servers, which previously ran a mix of various versions of Red Hat and Fedora.
Wikimedia’s entire collection of web sites—which includes Wikipedia, Wikisource, Wikiquote, Wikinews, and several others—serves up roughly 10 billion page views per month. At its peak, traffic can sometimes reach 50,000 HTTP requests per second. The organization’s hardware budget to date is roughly $1.5 million, and it spends $35,000 per month on bandwidth and physical hosting. All of its technical infrastructure is managed by a small IT staff consisting of only four paid employees and three volunteers. (Source: Arstechnica)
This is good new for Ubuntu which has in the past experience slow adoption rates with their server flavors. I am glad to add that this blog is powered by Ubuntu Hardy.