My friend purchased the rubberized case like wis3384 posted above. It adds significantly to the thickness of the device, plus it does interfere with typing on the top row.
I just purchased one of the "Snap On Covers" that Verizon offers for $19.99. It unfortunately has a bump in the back case for the extended battery, and it noticeably interferes with the sliding mechanism, so I'll be returning it.
I looked at the Body Glove case but again felt it made the device too thick, and came to the same conclusion of the "leatherette" case with the kickstand.
I'm wondering if perhaps a vinyl skin from UniqueSkins.com or iStyles.com would be better than a real case...