Well I ordered a screw in filter to have a go on the cheap, unfortunately the 30D clearly has a very strong internal IR filter - without the filter I was getting 1/400th at f8, with the filter on I needed to push the shutter speed out to a ridiculous 25 seconds to anything. Even then the files don't have that IR feel, I think with the long shutter speed I'm also getting some visable light contamination. I think I now have two choices, get the camera converted or forget about IR for now...
As an aside has anyone tried the Sigma SD14? It has an IR filter just behind the lens mount that can easily be removed and replaced, it could make IR much easier... a good solution if you're a Sigma user.
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