Canon says: "Up to 4GB or 1 hour (L and M, 30/15fps)"
It can also take SDHC, so maybe it'll allow for even longer videos in the future.
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EOS 5D|EOS 600|15-30|24 1.4 L|135 2 L|2x 580EX|2x CP-E3|ST-E2|2x Pocket Wizzard Plus II|IXUS 850IS|Crumpler|Manfrotto|
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