Firewire runs a nice current on it...
I only know this, because my Audigy has SB1394 on it... The warning for the audigy card 1394 is you CANNOT put anything that draws power off the 1394 on there... mainly because you will fry your Audigy. You can hook up self powered external devices like a HD or something like that.
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That's all I know... Just wait for Serial ATA anyways... that will just blow your hypothsis away anyways :P
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--Soyo KT333 DRAGON Ultra (Platinum Edition)
--AMD 1.4 @ 1.54 (11x)
--768mb of PC2100 (@140FSB)
--Asus v8200 GeForce3 @ 210/490
--Maxtor 40gb Quiet + 2 IBM 40gb 60GXPs (removable) + 8gb WD
--Audigy
--Maze 3, DD Gf3 block, 2x BIX, Eheim1250
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