"Mozilla aims to make Firefox 3 a record breaker. It wants the release of the next version of its flagship open source browser to be accompanied by a record for the most software downloads in a single 24-hour period 1.

"Download Day--as Mozilla dubs it--will begin the minute Firefox 3 is generally available and continue for 24 hours. Ahead of this release, expected in mid-to-late June, Mozilla has set up a website ( http://www.spreadfirefox.com/worldrecord ). This encourages people to organise Download Day parties, to run around collecting sign-up pledges at their university or place of work, and to place Download Day buttons on their websites..."

http://www.theregister.co.uk/2008/05/28/moz_download_day/