Karnak

Karnak ( http://www.karnak.com/ ) lets you do ongoing research on particular topic. Karnak will let you specify a topic and from then on will do ongoing Web searches on that particular topic, alerting you weekly via e-mail about any new resources it has found. Karnak will let you track one topic for free. Premium membership -- allowing you to track multiple topics at a time -- costs between $9.99 and $49.99 a month, depending on how many topics you want to track.

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