Personally, I use the top bar for chat windows, but you can put any type of window you want on there. Just right click on it and go to "Chatbar Settings" -> "Define Chat Windows", and enter a mask for the titles or windowclasses you want up there, for example, "* - Notepad" will move all notepad windows up there. You can put in as many as you want, separated by semi colons.
As for foobar support, check out http://www.xdocs.ls-universe.info/pie.php?xStatsClass (just search the page for foobar)