the javascript parallax is pretty interesting, here is a demo ^[1]

Edit: I just found a Firefox add-on that uses this effect for the new tab page.

Auto Dial 3D ^[2]

Edit2: And someone doing it without javascript at all (just css)

CSS 3D menias ^[3]

Edit3: Someone using the effect in a great way to tell a story

Hobo Lobo of Hamelin ^[4]

Remember lemmings? :-)

http://www.elizium.nu/scripts/lemmings/

Here's a bunch of "processing" graphics: http://ejohn.org/blog/processingjs/ demos are located near the bottom.

I think my favorite would be http://ejohn.org/apps/processing.js/examples/custom/substrate.html

Although this snake guy is pretty cool and interactive: http://ejohn.org/apps/processing.js/examples/custom/snake.html

Mario Kart ^[1]

This site ^[1] has a pretty nice implementation of solitaire, including card animation, all in JavaScript.

This site has an entire OS (an old one, btw :) in javascript: chiptune.com ^[1].

Antisocial ^[1] is definitely the best js graphics demo I've seen. Don't miss the 'play with the demo tool' link (after watching the demo, of course).

Enjoy.

Hypno trip down the fractal rug - for the 20 lines JavaScript contest - Zoom by Mathieu 'p01' Henri ^[1]

(Doesn't work well on IE or Chrome.) Update: It now works great on Chrome.

The coolest JavaScript effects I've seen are the Google Chrome experiments. http://www.chromeexperiments.com/

Obviously they will work best with Google Chrome browser, but some work in other browsers.

I thought this was pretty impressive:

http://safalra.com/web-design/javascript/mac-style-dock/demonstration.html

With an admittedly "cursory" investigation, these demos confirm that Chrome beats Firefox and IE for Javascript-heavy apps.

I like Algorithm Ink ^[1] a lot. It's a javascript port & extension of Context Free ^[2] by Aza Raskin.

Click on the canvas, they're interactive.

And click on Edit, and change the pattern generation algorithm live.

I've always loved everything that script.aculo.us ^[1] allows you to do. Update: raphaeljs ^[2] also looks like a great framework!

This is a "mouse follow" javascript animation from 2002 or earlier, the smoothness and accuracy makes for a pleasing effect. I could only find a version that ran in IE, but it is worth firing up IE or IETab and taking a look:

Link: Mouse Trail Clock ^[1]

Almost full port of Wolfenstein 3D ^[1] to Javascript!

The JS909 drum sequencer. Written without using a JS library, and even the sounds are done by Javascript

http://www.themaninblue.com/experiment/JS-909/

I've found these two sites quite facinating:

Using Canvas: http://9elements.com/io/projects/html5/canvas/

and

plain old javascript: http://www.uize.com/index.html, if nothing else, I find the 33 different image transitions available worth looking at this one.

Shameless plug: Canvas Image Distortion ^[1].

Not really graphical, but still stunning (even if I do say so myself)...

A long time ago, I wrote an HTML editor in HTML/Javascript.

You can download it here: http://www.boltbait.com/htmleditor/

One of these days, I'll update it for CSS. :)

I made myself a few interesting graphical effect in pure javascript (eventually with use of framework, for simplicity).

You can see it here, on mine blog: http://wilq32.blogspot.com/

For ex.:

• Make normal image, rotatable (http://wilq32.googlepages.com/wilq32.rollimage22),

• Canvas game prototype (http://wilq32.googlepages.com/home322)

• Some simple morph animations (http://wilq32.googlepages.com/home32)

• Pseudo 3d gallery(http://wilq32.googlepages.com/wilq32.rollimage)

This isn't necesarily amazing, but it's fun: paste into browser bar.

javascript:R=0; x1=.1; y1=.05; x2=.25; y2=.24; x3=1.6; y3=.24; x4=300; y4=200; x5=300; y5=200; DI=document.getElementsByTagName("img"); DIL=DI.length; function A(){for(i=0; i-DIL; i++){DIS=DI[ i ].style; DIS.position='absolute'; DIS.left=(Math.sin(R*x1+i*x2+x3)x4+x5)+"px"; DIS.top=(Math.cos(Ry1+i*y2+y3)*y4+y5)+"px"}R++}setInterval('A()',5); void(0);

high poly 3d duck with shading in 4K ^[1]

I was most impressed by this 512 byte Menger sponge: JSpongy ^[1]

There are also a lot of interesting effects in the js1k competition results ^[2]. The other day I was beaten by 1023 bytes of chess.