I've enabled the article-to-PDF generation extension[1] on http://en.wikipedia.org for live production testing. This is still slightly experimental, so the PDF download link and multi-article book collection part of it are currently limited to logged-in users only to let the load grow gradually.

We're going to be keeping an eye on load on the PDF generation server in case we need to pull it temporarily. :)

[1] http://blog.wikimedia.org/2009/02/20/wiki-to-print-feature-activated-in-six-...

[2] http://ganglia.wikimedia.org/pmtpa/?r=hour&c=Miscellaneous&h=pdf1.wi...

-- brion vibber (brion @ wikimedia.org) CTO, Wikimedia Foundation San Francisco