Just published: Islam in Inter-war Europe, ed. Nathalie Clayer and Eric Germain (New York: Columbia University Press; London: Hurst, 2008).
This book is of interest because it gives part of the wider context in which Traditionalist Sufism evolved. One article on "European Neo-Sufi Movements in the Inter-war Period" (by me) deals specifically with this, but many others are also relevant.
Other topics include: Muslim networks in early twentieth-century Britain, the first Muslim missions on a European Scale, Arab seamen in Britain, and 'Jihad Made in Germany.'