Mighty Mozilla Maketh Mucho Moolah

Mozilla's revenues (including both Mozilla Foundation and Mozilla Corporation) for 2006 were $66,840,850, up approximately 26% from 2005 revenue of $52,906,602. As in 2005 the vast majority of this revenue is associated with the search functionality in Mozilla Firefox, and the majority of that is from Google.

It's also doing rather well on just about every other metric, as Mitchell's post "Beyond Sustainability" explains. Recommended reading.