I think for music (muO) Stephane is better off with Squeak or Pharo implementations of Scratch, as Bert suggested. Nevertheless, Hannes Hirzel wrote a very interesting post:
What about snap (JavaScript implementation)?
http://chirp.scratchr.org/dl/experimental/JsMorphic/snap.html
It should run on tablets.
SNAP! is version 4 of BYOB, so it will have the fun computer-sciency bits that BYOB added to Scratch, and which should give Scratch a higher ceiling.
You should also find Jens Moenig's two pre-release articles interesting: http://www.chirp.scratchr.org/blog/?p=39 ("Enjoy it on your iPad!") http://www.chirp.scratchr.org/blog/?p=34
Markus Gaelli wrote:
Unfortunately we don't have Morphic for vectors -- do we? Might be a killer app on android tablets and other platforms which don't allow flash but would allow sharing of projects.
I might be wrong, but I think Dan Ingalls's Lively Kernel research is Morphic for vectors (specifically SVG)
(The Google Play store has the Adobe Air client for ARMv7 upwards. But HTML5 is a lot less hassle for users. Didn't Adobe announce an end-of-life plan for its Flash/Shockwave/Air clients in favour of HTML5?)
In my opinion, Scratch, as a bitmap app, already has potential to be a killer app on tablets and smartphones.
Yet if someone builds collaborative toys and games around a vector and touch-based Morphic, I think they will be embarking on a rewarding project.
On the same topic, we need great ideas for a touch user experience for Morphic Etoys over at Squeakland. It is pretty urgent as the single-touch OLPC tablet is out soon, and those lovely scripting tiles need fine motor control, tiny fingers, a two-button mouse and a keyboard.
http://squeakland.org/discuss/squeakland/
Have fun! David