Just as a idea, Here i am proposing for a best tool in the collaboration world, Lets call it LIM
Actually i like wiki syntax and mediawiki because it gives me a nice text based editing program where you can collaborate and see your document preview,
I like latex also become it gives you best of typesetting feature
So instead of wiki , developer should make a partial WYSIWYG editor (of course on web) which take best of wiki syntax and latex syntax.
Next when user click on "show preview" it will convert it to pdf and then automatically upload or scribd for ipaper conversion , ipaper is best at present for seeing document file on web browser. after converting to ipaper user will be able to see ipaper as embedded document.
Only disadvante of this tecnique is -- this system will be slow unless a high processing is done at server side.