The Mozilla.com favicon is a godzilla like creature, which does not seem to make a lot of sense, you would think it would be the Firefox logo or Thunderbird logo. If you read some of the history about how Mozilla.com got started and about the mascot the favicon makes perfect sense.
What I like best about the Mozilla.com favicon is how crisp and clear it is. It is easy to recognize as a godzilla type of creature. Hard to do in only a 16×16 space.
Hats off to Mozilla.com for a great favicon and congratulations on the success of the Firefox 3 download day! I know I have been enjoying Firefox 3!