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I have to agree with Not Ready here. I don't see what the possible predictions of panspermia are. Did anyone else read a prediction in that article? While this may be falsifiable, it kind of falls into the useless bin just like ID does.
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Panspermia is quite claerly a scientific theory.
http://arxiv.org/abs/astro-ph/9909013
I haven't looked into it but one possible prediction of panspermia, I would tentatively suggest, is that complex molecules having the same bases as life on earth's RNA/DNA will be found in the vicinity of our solar sytem.