As I publish alternatives to multiple choice exams, I have been sharing student samples via http://www.youblisher.com/. I have no reservations in showing my students last year's final projects.
Would teachers who give multiple choice tests be so willing to share their multiple choice exams?
If an exam must remain a secret, what does that say about the exam itself?
Yet, sharing my language arts and science alternatives with students poses no threat to their learning or my assessment.