The Algebraist by Iain M Banks. Massively complex plot, but very interesting. I like the idea of the Dwellers.
Also reading The Reform of Time: Magic and Modernity by Maureen Perkins. Only just started this one but it aims to show how colonialist discourses about the indolence of indigenous peoples and the working classes were linked to notions of progress and the suppression of "superstition". I bought it in the Hay Cinema Bookshop in Hay-on-Wye.