but I am trying to confirm that one way or the other. Etoys-to-Go hasn't gotten me anywhere -- anything I try to run just tells me that the file type is not supported. It seems the most viable solution would be a Google Chrome extension...
You might be right.
I took a quick look at the Chrome developer docs this morning, and there seem to be all kinds of restrictions preventing someone packaging a 100 MB application to run on the Chromebook.
Some kind of Javascript wrapper and VM as Kazuhiro Abe suggested might be the only way - apart from jailbreaking your device.
While it is not in scope at the moment - open platforms such as Windows Mac and Linux, including the OLPC, are the main targets - I wouldn't say it as impossible.
A lot of the underlying infrastructure has already been ported to Javascript by Jens Moenig and Brian Harvey's SNAP! project at Berkeley, so with the right volunteers or funding, an 'Etoys-lite' for the web might not be very far away. I haven't run SNAP! myself lately, so I can only guess that the full multimedia potential of Etoys, or compatibility with existing materials, might be a lot further away.
Anyway, I am just another Squeaker - not a spokesperson for anyone else. Have fun! David.