Not sure if this has been discussed but check out the new Selle Italia TT/Tri saddle with built in bottle holder, scroll half way down the page:
http://pezcyclingnews.com/?pg=fullstory&id=5018&status=True
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This one should stop you sliding forward!
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This is the best line in the corresponding caption:
which incorporates a moulded-in bottle cage designed to smooth airflow at the rear of a rider
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Ouch!!!
LOL, I didn’t know they sponsored Floyd!
Um… I think the bottle goes behind you. 