I saw three tiny bubbles on mine, too, but they don't bother me either. They can only be seen in a certain light and if you look very very carefully. I'll only ask for a replacement if I see multiple cracks. So far I don't see any, but I haven't used it much either.
+Quote from Dan:+
+16 G White. No cracks at this time, however, I noticed on day one three teensy, tiny air bubbles in the plastic case. Not enough to bother me. I've only had 3G for a week-- so I will be watching for cracks. If I develop one, I think the best strategy is to inform applecare-- but wait until there's an absolute fix for the problem coming from Apple. Why exchange a phone for one that will crack again in short order?+
+The bubbles by the way can only be seen under a good light. Does anyone else see these little bubbles? They are tiny and you really have to move it back and forth under a bright flourescent light. Direct sunlight doesn't really show them.+
+Thanks, Dan+