You know, we have been pondering, and pondering, and pondering...
...and we could do it for some more time, oh yes we could!
Things is, we don't have an unspecific upload area for varied files, since they are hard to access, edit, and comment upon - but we do have several places for people to post their ideas, more or less developed. To repeat val's comment, this site is good for having non-system specific writing commented upon.
You can go into the main site to post singular submissions, or create bigger compositions out of several of them. You can also try it here in Sagely Advice. As said, we are not big into uploading files, but it is possible to do so in the forums. (We are still pondering and debating on making an area for it.)
Note: you still weren't quite precise about the kind of help you require - is it assistance with writing, or editing/formatting? (Btw, were valadaar's tips about GoogleDocs and OpenOffice useful to you?)