One of my companies – Quova – just had a month where they served over 2 billion queries from their customers. That’s 64m queries / day (or 750 / second) – a huge milestone (double what 1 billion was <g>) and actually represents less than half of the actual queries since this only counts customers of Quova’s that have query logging turned on. Real time IP geolocation matters to a lot of people.
Non-financial numeric milestones are fun to track and always highly motivating for the team. I remember clearly the day Raindance did more than 1 million of conferencing minutes and then several months later broke the 1.5 million mark. There are patches where the growth curve becomes non-linear for a while and understanding what drives this (and all other growth dynamics) is very helpful to determining what to do to maintain and continue growth.