Torsten posted a link to the announcement of GwtSmalltalk, which compiles to JavaScript and runs on top Google Web Toolkit and, thus, AppEngine. This is interesting coming only weeks after Avi's announcement of Clamato... there's clearly some interest around combining Smalltalk and JavaScript at the moment.
You can try out a demo. Hint, to create new instances you need to use:
Kernel instanceOf:
