Addendum.

I also just crossed out the last date in my 2008-2009 planner. I've had the book for two years, and now I can start my new planner (though to be honest, I had already started putting dates in it weeks ago, right after I purchased it).

I can also put my old planner in my envelope of things I save, just like I did 2 years ago with my last planner after I used it up!