Thanks to everyone. Mozilla today received confirmation from Guinness World Records that they have officially achieved the record for the "largest number of software downloads in 24 hours."
New Guinness World Record - 8 million Firefox 3 downloads in a day!
From the mozilla site:
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Thanks to the support of the always amazing Mozilla community, we now hold a Guinness World Record for the most software downloaded in 24 hours. From 18:16 UTC on June 17, 2008 to 18:16 UTC on June 18, 2008, 8,002,530 people downloaded Firefox 3 and are now enjoying a safer, smarter and better Web.