Having not been schooled too much in political science but heavily in Linguistics and languages, I found Arnold's thesis on the origin of nationalism, relying heavily on an imagined linguistic community through the rise of print-capitalism (i.e. nations are younger than you would think) to be quite eye-opening. It was intuitive to me that most national communities are somewhat artificial projections (granfalloon, anyone?) but the deconstruction and analysis of the concept were a fascinating argument for that case. I really dislike his use of footnotes, though, which really hampered my enjoyment of the reading, and were a bit inexplicable at times.