I dont know if thats the right place to post, but there was one thing that annoyed me in pypanel. You can "blacklist" applications from appearing with the option HIDE_LIST that blacklistet apps with its WM_CLASS name. I put Skype and Pidgin in there and they were gone. But I just wanted the buddylists to disappear not the conversations.
if you change line 747
tclass = obj.get_full_property(Xatom.WM_CLASS, Xatom.STRING)
tclass = obj.get_full_property(Xatom.WM_NAME, Xatom.STRING)
it is possible to just blacklist e.g. Pidgins buddylist but not the conversation windows
you can use "xprop|grep WM_NAME" to find out