finding the mx record of a domain

[M.W. Chang]

What's the nslookup and/or dig command options to find the MX record of 
a domain?

-- 
   .~.    http://toylet.homeip.net
  / v \   Linux 2.4.22-xfs
/( _ )\  10:08am up 1 day 35 min
   ^ ^    load average: 1.00 1.02 1.00