There is a new mode in the ircd being developed at
www.neostats.com that uses an ! for operators. The problem this creates for mIRC users is that when the person leaves the nickname remains in the channel because mIRC thinks the ! is part of the nick and !somenick hasn't left yet.
Clicking in the nicklist to do a whois also does a whois on !somenick rather than somenick. This can be fixed with a script obviously.
Whois:{
if ( ! isin $$1 ) {
/whois $remove($$1,!)
}
else /whois $$1
}
The @ is still used, it's just that the ! gives more power in channels than @.