1: the ability to have mIRC open several servers automatically. having to manually open the second server every single time i decide to hit IRC got old real fast.
2: the ability to save which server the channels in the channels folder are in. and have it automatically connect to the appropriate channel, if you're not already connected.
3: having the maximization effect specific windows, instead of all of them or none of them.
there were some others, which i can't presently remember, but those are the big ones...
