We all probably know or have even used Google Search APIs, but over theperiod of time Google has consistently improved its tally of APIs itoffer to developers to use and customise various google products and services.
Here is list as of Nov-2005
4. Desktop Search
You can check all of them out at:http://code.google.com/apis.html
And if you hurry and use some of them, you can even win a Google T-Shirtand promotion on their developer page.