I also have to get a filter, which seems a little harder to come by- I haven't seen any listings for the size I'm going to need but I'll keep checking. In the end I think it will be well worth it if I am able to produce images that are anywhere near as interesting as these. There's such a magical, mystical quality to IR images that fascinates me.
Photo by Paul at http://www.flickr.com/photos/dexxus/
Photo by Kyle May at http://www.flickr.com/photos/kylemay/