I am working in Illustrator 15.0.2 (CS5) and when I try to move objects small distances, they snap to the nearest two pixels on some invisible grid. I can't find anything in the preferences. Here are some screen shots:
For new objects, turn off "Align to Pixel Grid" on the Transform panel.
For existing objects, select them first, then Turn off Align to Pixel Grid.
It was driving me crazy too... you can deselect the
To turn it of permanently, click on the flyout menu at the top right of the transform panel then uncheck
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