first time posting on this forum... i've lurked a bit though. hey everyone.
so i haven't seen this posted anywhere here yet, but
http://playmockingbird.com/ looks kind of cool. it's similar to omniludicon, but seems to be a bit more full-fledged. a flash-based mini-gamemaker if you will. (that is a lie. it is nowhere near as fully fledged as gamemaker. the paid version claims to be much more than the free version, though.)
i played around with it, the physics seem a bit floaty, a la omniludicon. it also seems like it can't handle too many objects per scene.
but, and here is the interesting part, you can upload your own images as sprites and backgrounds, and upload your own music.
it's also embeddable on your own page, which is a nice touch.
worth a shot maybe, it was an austin igf winner. thought for sure i'd see it somewhere here.
anyway, happy gamemaking. nice to post here.