1 It would be nice for PikiPiki to allow people to upload files and embed them into the page. We can do this using HTTP/HTML file upload in a form. This could be either a picture to be inserted directly, or some other document to be linked.
3 The KmWiki WikiClone supports in-place editing of diagrams using a JavaHotDraw-derived widget, and objects in the diagram can link to pages. This is pretty cool, but quite complicated and not necessarily terribly useful.
5 OriginalWiki just supports links to documents, but doesn't give people a way to upload: they have to have their own web server, which makes things difficult in some environments.
7 It would be nice to let people upload multiple files and replace them later.