Tesco plan to kit trolleys out with DVD players for kids according to this news article. The manufacturers, Wanzl, believe that this advance represents "a new dimension of creativity to an existing product". Hmm. I think it could be another good reason to add to my list of reasons for not visiting Tesco.
Personally, if you want innovation, then you need this:
Image shamelessly stolen from National Cart Company Inc..
Meanwhile, check out The Center For Prevention of Shopping Cart Abuse. Very worthy.