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I like the simple one (number 1) but I didn't get the milk part until I saw number 2. Maybe there is a way to play up the milk drops in the rest of your branding?
Of course, now that I know it is milk, it is all I see. Perhaps the upward curves at the top of the lemon don't seem much like a shape that a milk drop would fall from... but I really like the sensous curve you have. it is unique and eye catching.
I don't think number 3 helps the milk idea very much. It just looks like the bottom part of the lemon got cut off.
I often think of bubbles in milk - see picture: http://tiny.cc/hbgSs
Here's another good milk drops/dunking in milk photo for inspiration: http://tiny.cc/MrUAF
I am enjoying the progression of this logo! Look forward to the next round.

I just saw you updated some pictures - I like the middle one of the latest 3 that you posted. (Where there are 2 drips on either side of the center of the lemon).