Back in June the developers behind AppJet closed up shop to focus on EtherPad, the real-time collaborative editor we called "dead simple" in our initial review. Since then they've worked at a breakneck pace to improve EtherPad, trying to attract paying customers for hosted and on-premise installations. Today the company announced a fantastic new addition to EtherPad's core capabilities: to go along with the real-time editor, they've added a real-time playback of edits they call the "Time Slider."

The previous history system of EtherPad was fairly clunky. Users had to stop and save revisions in order to view them later, which disrupted the fast pace of collaborative editing that make EtherPad such a joy to use. The new Time Slider solves the problems of the old system by letting you play back all the edits to a page. It works something like an online video player, letting you star particular spots of interest and go back and forth in time at will.

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The previous history system of EtherPad was fairly clunky. Users had to stop and save revisi