There's a new version in testing. It supports blinking and tap-and-hold on the button itself. Check it out: http://maemo.org/packages/package_instance/view/fremantle_extras-testing_free_armel/pidgin-maemo-docklet/0.0.2-1
It needs your support - especially your thumbs-up ;)

works pretty well. Is there any way of changing where it appears on the status area?