Answers.com is becoming my favorite search engine when I am looking for background information on a subject.

The site has an extremely thorough and up-to-date section on RFID. For the most part, the information appears reliable and balanced, and shows a remarkable understanding of the technology and its implications.

Answers.com used to be called GuruNet. It is unlike traditional search engines, because it puts together information from various sources into a single-page, user-friendly narrative. Think of it as part search engine and part encyclopedia.