This article is from the Problem Behaviors in Cats FAQ, posted to rec.pets.cats newsgroup. Maintained by Cindy Tittle Moore with numerous contributions by others.
Outside cats, especially those not your own, can present you with difficult problems. Cats are not regarded the way dogs are under law: there is usually nothing that says you have the "right" to keep cats out of your yard, for example (whereas dogs can be required to be kept confined or on leash, for example). There are historical and practical reasons for this -- but there are still practical steps you can take to resolve several problems. The following is written primarily for people who want to stop other cats (i.e., not their own) from being a nuisance on their property.
As a cat owner, you should consider ways to minimize your cat annoying your neighbors. You could keep your cat inside, supervise your cat when outside, bring it inside at night, etc. All cats allowed to roam outside should, of course, be neutered.