See: http://developer.apple.com/techpubs/macosx/Cocoa/TasksAndConcepts/ProgrammingTopics/SysServices/Concepts/properties.html

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SpellCatcherX uses this to allow the user to add items to its Services/Modify Selection menu, and to configure which Modify Selection services should actually appear in the menu (on-the-fly).

PerlPad uses this to allow simple Perl snippets that manipulate text to be turned into items in the menu.

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Isn’t there something (an UnsanityHaxie, perhaps) that lets you modify your services menu so it doesn’t have a bajillion services? ‘Twould be nice… I never use the services menu because there’s too much junk in it.

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Try Service Scrubber (http://www.manytricks.com/servicescrubber/). —-

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IceCoffee [http://web.sabi.net/nriley/software/] adds a Services submenu to the contextual menu, and you can exclude services from that.