Over at his Stone Temple Consulting site, Eric Enge has published an interview with Google's Rajat Mukherjee, project lead for the Google Custom Search Engines group.
One interesting point Mukherjee made was that more than 100,000 Custom Search Engines have been created since the service launched in October. He is also a big believer that search will become highly distributed, with search occurring at the "point of inspiration." That means search will more often occur at the web site you are on when the idea to perform a search strikes you.
Source:→ SEW BlogGoogle, CSE, Google Custom Search, Engineer, Interview