This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Although we don't cover Spring Security with OSGi in the book, the significant class and package detangling that Luke did in Spring Security 3 makes Spring Sec much more OSGI-friendly than earlier versions, although I think there have been a handful of bugs reported since it was released. I suspect with continued adoption of OSGi and DM Server, more people will be exploring it and (hopefully) documenting any issues.
Sorry that's not much of an answer
Author, Spring Security 3 (the Book), Packt Publishing, 2010