Tributes to Fred Halliday:
Sami Zubaida, Guardian, Fred Halliday obituary, 26 April 2010
OpenDemocracy, Fred Halliday, 1946-2010: a tribute, 26 April 2010 "The death of political analyst and international-relations scholar Fred Halliday extinguishes a voice and a light that have illuminated world politics for more than forty years. David Hayes pays tribute and presents a selection of his work for openDemocracy."
OpenDemocracy, Fred Halliday 1946 – 2010
I would recommend many of his books, notably (in the context of this blog) Arabs in Exile, The Yemeni Community in Britain, I.B. Tauris, 1992. It's a pioneering study of Muslims in Britain, still relevant today.