I think a really nice feature the online editor would be sprite folders, for example sprites that are only in one backdrop, this would be a nice feature

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I agree! It would make life much easier. There's another topic like this one (http://scratch.mit.edu/discuss/topic/23443/?page=1#post-616534). You can go check it out of it you like.

um.. isn't it weird that there are 3 duplicate topics, but by different users?