Yo, i just did a battery test for the 30GB ipod color. The conditions were the defult setting with a few minor ajustment:Frequency set to 15(to prevent crash), Duo Puff WPS, 503 shuffled playlist with mostly 192 and 128kbps mp3 and 1 OGG. version 060721-1142
Not sure is this info any good for the devs.. but it is here.
I graphed the result myself so it is a little messy(i did it with graph paper, buy my scanner did not scan the lines..)
Here is the graph.

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