just a quick fun submission :D $colorize(string) to color the parentheses in the string according to depth. each new level of parentheses has a new color, as you can see from:
http://img230.imageshack.us/img230/1197/colorizehf0.jpg
alias colorize %a = | return $regsubex($1-,/(\()|(\))()/g, $+ $calc(2+(-$len(\2$c(\2))+%a)% 14)\1)
alias -l c inc -u %a $1 -1