Well, I got the A900 out for some good IR attempts.....and it is no good at IR! I used the same settings range that I used successfully with my A700, but this thing must have a much stronger IR filter on it. The shots just came out red instead of red + IR like normal for the R72. No IR 'pop' to them at all, even with shots in the 20-30 second range. Even with a lot of help from photoshop, the IR effect is not there.
I did get an IR modded F828 to play with, and it did quite well, but I am not used to editing photos from an actual modified camera yet. Need some more practice there. I may have found a place that modifies Sony's even though they are not on the website list. Too bad I did not grab an A300 when they were on sale cheap at Circuit City!