Canvas-based game: Ajax has come far

The online game “Berts Breakdown” is fun and there is no Flash involved! It is all done via JavaScript and the HTML5 canvas tag. Quite impressive. Warning: Canvas means that this game won’t run on Internet Explorer, only on Firefox and Safari (and possibly on Opera). [Source: Ajaxian]
[Update 2009-12-13] More pure JavaScript games are shown at EffectGames.