I installed Monad/MSH earlier today, whipped up a dorky little prompt:
# command prompt goofiness.
function prompt {
$ret = "$ENV:USERNAME@$ENV:COMPUTERNAME".ToLower() + " $(get-location)"
if ($nestedpromptlevel -lt 1) {
$ret += "#"
} else {
ret += ">" * $nestedpromptlevel
}
return $ret + " "
}

Have fun!

I've become such an MS-Dork. Still, MSH is really neat stuff! I'm pretty bummed that it won't make it into Vista by default.