Subset Searching at Google

Used Google Co-op much? No? Other than developers and experimenters, I have heard little use of Google Co-op, especially for searching. That has all changed with today's launch of Google Custom Search Engine, an application of Google Co-op. The Custom Search Engine was announced yesterday.Like other search engines that search a subset of a larger database, Google's Custom Search Engine lets users specify specific sites to included or excluded, and some can be prioritized over others. Creators can also specify that certain words should be added to the query. Other subset (or vertical or custom) search engines include Yahoo! Search Builder, Rollyo (which uses the Yahoo! database), and Eurekster's Swickis