I must heartily recommend Fellowship 9/11:
Michael Moore’s searing examination of the Aragorn administration’s actions in the wake of the tragic events at Helms Deep. [...] He looks at how — and why — Aragorn and his inner circle avoided pursuing the Saruman connection to Helms Deep, despite the fact that 9 out of every 10 Orcs that attacked the castle were actually Uruk-hai who were spawned in and financed by Isengard.
(Hat tip to Reason’s Hit & Run.)