I am using the one developed by Xurble here http://xurble.org/projects/iChatMiranda and I've also tried the plugin dll from Trillian but the local lan clients list in Bonjour doesnt refresh when people log off. My Apple Mac colleagues lists refresh whenever someone logs off.
I think someone needs to pick up the Xurble baton and carry it further, I'd love to but I havent programmed in 15 years (Pascal and Assembler!).
I believe it would then be the complete IM if that was made possible.
Thanks for all your work, love Miranda