That rare thing, a plugin for Illustrator - Phantasm CS version 2 for CS3 to CS5, with CS6 due soon. It costs £49 and you can get it from here.
Amongst other things, it creates vector halftones and desaturates vector artwork.
Just in case you are too young to remember, the graphic is an adaptor for a 45 rpm vinyl record that has had the centre punched out for playing on jukeboxes.
It's part of a logo I designed for a DJ. If you click on the thumbnail you can see the halftone effect more clearly. At small sizes it loos like a gradient fill, which is ok too.
Bob.
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