I really, really miss the file-browser-applet that was available in the gnome panel -- is there an equivalent for unity?
I've started using the Screenlets program (available in the Ubuntu Software Center) to replace the applet items I used to run in gnome-panel (i.e. weather indicator).
Screenlets has a file browser applet.
I know that this isn't exactly equivalent, but it works.
No, AFAIK, this applet has not been ported (and it would be rather difficult).