Nice photos!
Something to try, if you are interested in digital IR without converting a camera, is to pick up an old Nikon D70. The D70's IR blocking filter lets a bit more IR through than the IR filters of most subsequent cameras. One still needs to do a long exposure, but it can be a lot shorter than with later DSLRs (like 1/2-1 sec instead of 30 sec, in good sunlight at a medium aperture). Mine even works with a 760nm filter, which is a bit of overkill. The disadvantage of the D70 is it's only 6 mp APS-C, but that means it's really inexpensive now (like $30 in the US), and the image quality is perfectly fine for web use.