I used to own a Canon G3 camera which was pretty sensitive to infrared light. You can shoot pretty amazing shots with an IR sensitive camera and an IR filter that only lets the infrared spectrum through.
Joi Ito blogged about his Leica M8 being IR sensitive and a bit jokingly he’s created an Leica M8 Magenta Madness group in Flickr. I’d suggest Joi go even further and get an IR filter and try to use the IR sensitivity as a feature.
Even with the little IR photography that I did, a whole new world was opened to me. I suddenly had a new type of vision which was pretty cool. Coming to think of it I guess I’ll go and try if my 30D is capably of any IR shots. I recall Canon’s new IR filters are pretty aggressive but there’s hoping.