First of all we have an IRC channel. Here are the specifications:
Server: irc.emule-project.net
Channel: #emule

A small note: Please do not expect that the devs will be available for chat at all times. Mostly we are quite busy working on the emule project.

If you are looking for a channel which could be in your language, try joining channels with this names:
#emule-yourlanguage (for example: #emule-german, #emule-spanish, etc.)