Flying 'blocks' of water can be found after the generation of the world.
Seed : 1780409288076535210
Coordinates : 423;60;-49
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Well, they have been added to the description.

Confirmed, also for 1.5.2
Confirmed here too.

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
(Automatic Message)

Is this still a concern in the current Minecraft version 1.7.4 / Launcher version 1.3.8 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Seems to be fixed in 1.7.4.
Are you testing the seed in the original report? It has probably changed due to 1.7's new generation.

Since worldgen changed, resolving this ticket to the 1.7 floating water.
Here is one as well, 1.8.4:
http://i.imgur.com/LNdoQss.png
7758762185538429135 (-300 63 200)
seed and coords is in the image
Please attach the seed and the coordinates.