From the Pen of... - Assorted short writings by O'Brien. - http://www.ncf.carleton.ca/~bj333/HomePage.flann.html
The No-Bicycle Page - Extracts from novels and musings, and links. - http://www.hellshaw.com/flann/
A Biographical Introduction - Eric Mader-Lin gives an overview of O'Brien's life and books. - http://www.necessaryprose.com/obrien.html
Dalkey Archive Press - Descriptions of some of the best known books, and extracts, commentaries and essays. - http://www.centerforbookculture.org/dalkey/backlist/obrien.html