No, Christopher, voter disenfranchisement in this country only applies to convicted felons, and it differs from state to state. Some states even allow prisoners doing time for felonies to vote from jail. Like Maine.
"In New York State, you may not vote while you are incarcerated and your right to vote is immediately restored upon the expiration of the maximum sentance or when your parole ends, whichever occurs first."
None of the non-violent protesters will be charged with a felony, many may get just a DAT (Desk Appearance Ticket,) depending on the NYPD's mood, and the rest, even though they've gone to the holding pen at "Little Gitmo," will get some misdemeanor charge or other like "disturbing the peace," or "obstruction." Many of these charges will eventually be dismissed. And they are not felonies.
Last night, for instance, in Herald Square, and in the Union Square area, bystanders were arrested along with the protesters-- such charges are bound to be dropped as the defendants' lawyers will start serving the NYPD with subpoenas regarding the video surveillance they are using.
So Christopher, you can sit-in, die-in, and yell in the streets, get arrested AND convicted for it and still vote. At least for now. Who knows what will happen when they pass Patriot Act III.
My advice, though, is to think carefully about it, and avoid getting arrested right now (if you can help it,) unless you are making a great big media splash. You will be held in a hot, uncomfortable, crowded, former bus depot with oil-soaked floors and be given very little food or water (do you like dry bologna sandwiches?) for up to 3 days.
I may change my opinion, however, upon the arrival of Mr. Bush, in town, depending upon how things go.