Ajax Toolkit for Internet Explorer
JavaScript application which works inside Internet Explorer for Windows, which creates JavaScript applications for Internet Explorer for Windows (with cross-browser runtime support promised for the future). Included is an 8-minute screencast unites screensharing and voiceovers via SWF, which should induce some cognitive dissonance among those who insist "ajax replaces flash" and similar non-starters.
Quoted from John Dowdells' blog.