The Palm-Wine Drinkard and My Life in the Bush of Ghosts by Amos Tutuola

Efuru by Flora Nwapa. The first published book written by a Nigerian woman.

No Longer at Ease is Achebe's follow-up to Things Fall Apart.

Half of a Yellow Sun, by Chimamanda Ngozi Adichie

"GraceLand" by Chris Abani. I loved this book. Here's a blurb from Publisher's Weekly: "Abani's debut novel offers a searing chronicle of a young man's coming of age in Nigeria during the late 1970s and early 1980s. The vulnerable, wide-eyed protagonist is Elvis Oke, a young Nigerian with a penchant for dancing and impersonating the American rock-and-roll singer he is named after. The story alternates between Elvis's early years in the 1970s, when his mother dies of cancer and leaves him with a disapproving father, and his life as a teenager in the Lago ghetto, a place one character calls 'a pus-ridden eyesore on de face of de nation's capital.'"

any more nigeria suggestions?

I absolutely love this book. A classic in all of the best meanings of that overworked word.

Things Fall Apart | Chinua Achebe

I haven't read it for several years, but remember it being incredible.