Was on one of the servers last night, I think there was around 90/120 players. Blufor had made their base on Cherno docks, we were attacking it in huge numbers. At one point we had a plane doing round trips to balota, filling it up with men and they were parachuting out into the base while around 13 of us were pinning the base down from the town. It was the biggest battle I have ever seen. Sadly it ended prematurely when a spoilt brat hacker teleported everyone into the sky where we fell to our deaths. Up until that point though it was the most immersing gaming experience ever.
Yup, ARMA is hands down still one of the best games out at the minute.