[Orgmode] Agenda not working or am I misunderstanding how it works?

[U Avalos]

I have the following completed todo item:

** DONE pay Yolanda
   DEADLINE: <2009-11-24 Tue> CLOSED: [2009-11-25 Wed 11:18]

Yet it still appears in the weekly agenda. Is it not working right or is that 
how it's supposed to work? 

Also, when I hit C-c C-w (show deadlines in current buffer), I get ALL todo 
items, even completed items that are really old. Restricting it with a numeric 
prefix (ex: Esc 5 C-c C-w), doesn't work either. I just get all items plus or 
minus the number of days.