Andrew Davidhazy - Infrared Photography Examples - Low to high tech and all in between. He writes on a wide variety of articles on all things photographic. And, teaches at, arguably, the best photography school in the US. Not for the beginner.
Invisible Light - Infrared photography site featuring the work of Andy Finney. The site also includes a bibliography, links to other sites, and technical information on infrared imaging, including journal and patent abstracts.
Jeffholbrook - Black and white infrared images of spooky graveyards and surreal landscapes.