Using the Meebo client on my Android Phone, it automatically added and grouped fleetmates from my Tribble fleet and Holodeck fleets to my contacts list (grouped by fleets).
I'm able to send whispers to my fleetmates individually, but I don't seem to be able to join the actual channel. However, I believe that this is the limitation of the client itself. My IRC app doesn't seem to support XMPP (anyone know of one that does for Android?).
How did you get it to work on Meebo? did you use the jabber service? or what?