I got Skype working with iBus (and it took a while at the time), but recently both my working set-up (on 12.04) broke, and any attempts for a new set-up (on 12.10) failed. (On 2 separate computers.)
That is to say, iBus does not input in the Skype window any longer. (iBus is running, and selecting the Anthy input method has no effect when the cursor is in the Skype window. It works fine via keyboard shortcut or the iBus menu in other applications.) I have the lines
export GTK_IM_MODULE=ibus export XMODIFIERS=@im=ibus export QT_IM_MODULE=ibus export XIM_PROGRAM=/usr/bin/ibus-daemon
.bashrc. And have the qt & gtk versions of ibus installed. Has anything changed for Skype and iBus to stop working?