Larry, make the experience a positive one. Swimmer is dead on balls accurate, the supermarket should be an opportunity to stalk the fairer species (ref. frozen foods section on a hot summer day). If someone blocks your path or leaves the cart unattended, it is your obligation to throw in some additional things, as a concerned shopper, that you think they cannot do without. For a repeat offender, if you are really bothered, put something on the bottom rack of the cart and then wait to see if they get nabbed.
Finally, cart etiquette doesn't just happen inside the store, but I have not found an effective way to deal with people who just let them roll after their grocieries are in the car, so I still park about 1/4 mile away.
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