IIRC the higher capacity cards are SDHC rather than SD. Am not sure if SD devices will take SDHC cards but I think SDHC devices work with SD cards.
Chances are the 450D and newer compacts are SDHC.
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Andrew - My pics on Flickr
Canon 7D, 24mm f/2.8, 50mm f/1.4, MP-E 65mm macro, TS-E 90mm, 100mm macro
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