"At Google, we like to launch early and often, and iterate on our products. We often experiment with new features in Toolbar and sometimes we have to decide how best to focus our efforts on features we expect will yield the most benefit to users in the long run. Along these lines, the Quick Search Box feature will no longer be available in Google Toolbar. At this time we have no plans to release it separately, but I'll keep the community informed if these plans change. Thanks to all the users who helped us test and improve the feature," says Brian Rose, from Google.
Quick Search Box is still available for Mac, iPhone and Android, but each flavor of the application has different features. I think it would be a good idea to add all the features from QSB for Mac to the Windows version and release it as a standalone application. It could be a lightweight alternative to Google Desktop, an extensible open source application that lets you search the files from your computer and your online data from services like Gmail or Google Docs.
{ Thanks, Marcus. }