Well there are several ways of contacting each other. I discussed a lot about it with turaak, but we didn't decide anything. Each way of communication has it's own pros and cons.
MSN is good for 1 on 1 chat, but it sucks when a big group of people (such as our clan) wants to communicate among themselves.
VoIP programs are somehow good, but not everyone owns headphones.
mIRC or any other such chat program is quite good for group chat, but the problem is the fact that people have to first download it :x
Forum can be used by everyone and is a good way to communicate with each other, but you usually have to wait for an answer for hours.