Today we learn of two more Googlers leaving the search giant: Kevin Fox, a UI designer who worked on Gmail, Google Calendar, and Google Reader, and Nathan Stoll, a product manager at Google News. Fox is going to an unnamed startup. Stoll is vague about his plans. Update: Add New York sales vet David Hirsch to today’s list.

Remember, these are two three employees out of 16,000 and the end of the year is a natural time to leave a job for something else. But Fox and Stoll join a growing trickle of Google veterans who no longer find Google as alluring a place to work as they once did.

Anyone know what Google’s employee churn rate was in 2007? Anyone want to guess what it will be in 2008?