Code:
alias chanuser.count {
  echo -ac info2 Channel User Count . . . .
  var %chan.ctr = 0, %chan.tot = $chan(0)
  while (%chan.ctr < %chan.tot) {
    inc %chan.ctr | var %chan = $chan(%chan.ctr)
    echo -ac info2 - %chan has $nick(%chan,0) users.
  }
  echo -ac info2 Channel User Count End
}


u can edit it to output however u want, but thats how u'd do it, enjoy

all i'm doing is looping though each channel $chan(N) and showing how many users are on it $nick(#chan,0)

Cobra^