If you had asked me three weeks ago how one might go about creating a federated search interface that could intelligently combine the results from academic and public libraries, I would have shrugged. If you had then asked how one might go about integrating search results from other sources, such as online journal indexes, weblogs, Amazon.com and Google I might have laughed. But if you had waited another week and asked I would have pointed you to this.
Evergreen ILS
Open Source Library Software