for some info on the servers > http://www.theirishguard.com/viewtopic.php?t=1502

I believe they use TeamSpeak as they make a sure point that any joining member got it and can use it (meaning you got a mic and speakers..? :p)

yes, the private server is really nice and i believe everyone enjoy playing on it
got some problem sometimes with balancing the team both in numbers and skills (read clanstacking) but there is not all the BS you can find on other servers

there is always lone wolves but there is sometimes some nice commander taking care of things, with most of the time 2 to 4 squads more or less filled.

a TIG member should be able to answer your question better though

  TIG Rocks

Yes we still use TS. We have it broken down into alpha, bravo, charlie, echo and so on. But we are experimenting with voip to see which is more effective.