How now foul Drow.
The pronunciation guide reprinted in the Dragon Compendium seems to indicate either is correct.
But if it's d-r-long o, then I can't say "How now foul drow".
Of course I COULD say...
There once was an evil young drow,
Who would murder wherever she'd go.
Her friends she did slay them,
To cause further mayhem.
She was not a nice person to know.