Unfortunately, this isn't something Alice does easily - even just combining two files into one takes quite a bit of work You have to individually copy the methods (copy to the clipboard and then - without closing Alice - open a combined wold and copy the method into it). If a character isn't alrealy in the new world, you
also have to manually add it to that world before the copy drop will work
For options going to a video format, see
http://www.alice.org/community/showt...hp?p=27#post27. Also do a search of the forum for "video" or "movie". I've tried the screen recorder they recommend (BSR) and it works pretty well. The free version doesn't record sound but I've never found that Alice does that very well anyway.

Windows Movie Maker seems adequate for combining clips and does a fine job of adding audio. I would recommend using the "export to best for your computer" option - that generally gives me a nice .wmv file.
If you find any better ways -
please post them - alternately if you do try the path I outlined, would you also post the result. It's a shame to put all the work into a group project like yours and then not have a simple and proven path to get them in a form the public can view easily.

Maybe if enough people try something like the above we can at least take care of the "proven" part.