Can't get the frickin things open
Here are two tips:
  1. Quickly and with good pressure, run the bottom edge of the CD along the reasonably sharp edge of something hard, like the counter of the music shop. Press hard enough that you bend the case slightly. This will slice the plastic wrapper open pretty well as the hard edge bounces along the ridged plastic of the jewel case.
  2. Now that you've got the plastic off, you can disengage the bottom hinge of the case and flip it up and over, revealing the tamperproof sticker at the top, making it much easier to get off, as you can pull the case against the sticker rather than trying to get a fingernail under the sticker.
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Bitt Faulk