Fixed by
gaim (1:2.0.0+beta3.1-1ubuntu4) edgy; urgency=low
.
* debian/patches/07_transparency_for_notication_area_icon.patch:
- make the icon on the notification area be transparent with the panel
** Changed in: gaim (Ubuntu)
Status: Confirmed => Fix Released
--
gaim icon is not transparent
https://launchpad.net/bugs/53125