A browser bookmarklet for rapid serial visual presentation
Use it by adding a bookmark to your browser, with a URL something like this:
javascript:(function(){speed=2;document.body.appendChild(document.createElement('script')).src='http://johanfforsberg.github.com/rsvp-bookmarklet/rsvp-bookmarklet.js';})();
Then mark some text and activate the bookmark. You can pause the display with spacebar.