Yes the existing tools are pretty awful... but they're generally made by small companies that don't know how to build tools, building on the <i>current</i> implementations of HTML, CSS, and Javascript. Has anyone given it a real shot, targeting the newest features of HTML5?<p>Adobe on the other hand has built industry standard tools over and over again (Photoshop, Illustrator, etc). They've proven that they can export their apps to other platforms (iPhone). What they're not so good at is building open browser runtimes...