[Schnabel]

Do you really want to show your gratification for CD!?!? If so I say don't opt for the 2-years, go for the 6 months because CD will remind you every 6 months that you do appreciate it. It's $5 more bi-anually, but seriously, that's just $5. I barely post here anymore and I still pay it because it has made that big of an impact in my life.
EDIT: Proud supporter since 7/19/2009 here! : )