Here are a few reviews of Chinua Achebe's works:

Achebe Novels and Nigeria
Looking at the Significance of Achebe's Background
Cora Agatucci's Hum 211 Site: Scholarly Articles Online, Infotrac Bibliography, Interviews with Achebe
African Literature and Cinema Electronic Discussion Group
The Role of Women in Things Fall Apart by June Chun
Women in Achebe's World by Rose Ure Mezu
Achebe's Use of Language by Melissa Culross
Africa and Africans in Conrad's Heart of Darkness by Candice Bradley
Coversations with Chinua Achebe
Conte on Things Fall Apart
Foreign Affairs Envoy
Request a copy of Terry Cottrell's essay on Fragmentation in Things Fall Apart and The Waste Land