From the Official Google Blog: 9000 and counting:
This month, we passed the 9,000 mark for enterprise buyers of the Google Search Appliance and the Google Mini.
I don't know about you but that seems like an absurdly low number. So perhaps the demand for behind-the-firewall search isn't so large after all? Or perhaps corporate folks have not moved their most secret data to the Web even behind their firewalls? What's up with this?