Lots.

- Fix bugs :)
- Show progress bar as long as data is being downloaded
- Show sane error messages.
- Asynchronously load bonobo components
- Support streaming
- Investigate printing
- Investigate practicability of embedding Nautilus or one of its
  views for directory listings (http(?), ftp, WebDAV, ...)
  - maybe using a specialized <embed> tag as a custom plugin?
- Allow definition of mime types that should not be
  supported in gconf keys. If a component fails to load,
  ask the user if he wants to ignore that mime type in
  the future.
- Comment the code a bit and clean it up.

- Lots more (don't remember right now)