Processing is one of those things I keep on coming across, first through toy hackers such as krazydad, ni [video] and The Curiosity Collective and more recently in Maker articles and O'Reilly books such as Vizualizing Data and Making Things Talk. I'd even invested in the rather heavy Processing, Creative Coding and Computational Art, all totally inspiring, and yet I somehow hadn't got around to actually doing anything with it. You see it's the whole Java thing that puts me off; when it comes to playtime life's far too short to wrangle a CLASSPATH or compile an applet.
The result is a single HTML page you can double click on an example to view the Processing source, edit it, and see the results immediately without refreshing the page. Download and reopen it in Firefox and you'll be able to save your changes locally. Not all the examples work, in particular those which use external images. You can save your changes in other browsers if you follow the generic TiddlyWiki instructions. .
All great fun, but it is just a hack, and I somehow doubt the purveyors of more complete bids for global vendor lock-in, such as Silverlight and AIR, are too worried as yet. But they should be. A combination of video as a first class citizen of the Web, Canvas in decent browsers and libraries and emulations using SVG elsewhere seems pretty close to being good enough. As much as I'd love to see more declarative approaches take off, I can't help but think we've entered the age of the canvas!