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Whoa! This is incredible!

I've never seen anything like this --- an accurate 3D model of a brain, which you can click and drag to rotate. This has a lot of educational value. (Apparently, static 2D images of the brain on Wikipedia et al don't really give you a good "volumetric sense" of what the brain looks like.)

My only wish is to be able to "highlight" the various structures of the brain, e.g., the Hippocampus, to know where they're located / how big they are in relation to the whole brain.

Bravo. Wonderful work.

3D Slicer - http://www.slicer.org/ - gives you detailed 3D models for the brain generated from CT scans. You can use it to reconstruct other organs as well.
The mouse wheel zooms.
It also zooms when you're trying to scroll in the left frame to read the text.
To make it run on Linux:

google-chrome --enable-webgl --ignore-gpu-blacklist

Works fine out of the box for me with Chrome 15.0.874.120 on an Arrandale laptop running Fedora 16.

Like most WebGL apps, though, it appears to load (or maybe preprocess) a ton of data. And it has no feedback. So I watched a blank page for a while, browsed in a different tab, and came back later to see the pretty brain.

WebGL demo writers (and this applies to pretty much all of you): please learn how to provide UI feedback on loading. The enormous client data set you have locally doesn't work as well across the internet, and the default state of your app is horribly broken without it.