I have read ur report about the trip to Brackendale with interest!! I ordered a 100-400 yeasterday after conidering a lot. I have also a 30D so its interesting to read ur thoughts of the limits of the cam. I infact also have a friend with an 1d so I can compare with him when we meet next time.
here are my add at flickr:
http://www.flickr.com/photos/arnesahn/