Here's a report of a talk by a prominent scholar of Islam, Ralph Ghadban, given to a small audience at Ohio State University. He argues that many Muslim immigrants never intended to integrate into Western society, and that one of the biggest shocks they received in Europe was their encounter with secular legal systems.
Ghadban is also very critical of Tariq Ramadan, the controversial figure viewed by some as the face of 'moderate' Islam in Europe. Ghadban considers him a dangerous man because he wants to keep Muslims segregated from their host European societies. Ghadban, who was born in Lebanon and spent many years in Germany, is now at Princeton. He's written a very interesting book on Ramadan and the Islamization of Europe (unfortunately, I don't think it's been translated into English).