I just took the written and would like to pass on a few things:
1-Most surprising, none of the questions I worked with in my written study materials, my coursework, or the exams4pilots website were on the written I took. There are alot of comments made by recent test takers to the effect that the FAA is trying to keep the question formats revised in order for people not to just cram questions into their heads and then spew out the answers. Believe me, I dislike the FAA writtens as much as the next person.
2-Like most of us, the questions I missed were those where there was plenty of reasoning why 2 of the choices should have been acceptable. One I missed actually referrred to an item in the support materials that was no longer there (go figure) Amazingly, I got those questions about the HSI/RMI/ADF correct, which I thought I would never do, and like Ghery, will never see those instruments in any plane I fly.
3-Many questions about icing, I recall having 6 of them...not just what happens to the airfoil in various icing conditions, but also questions about proper control inputs should ice become a factor in flight. (the Colgan Effect?) However, few questions about understanding weather, which I found surprising since so much decisionmaking depends on WX understanding.
4-Some RNAV / GPS questions on the test, but not as many as I thought there would be. Alot of the plates in the example materials were still using the non-briefing strip format, and there were not many GPS approaches given.
Hope this helped give some useful info on the test. Oh, and alot of what is confounding you now, becomes much clearer once you start flying the theory in the plane and see how the real world works. Its a load of fun and you'll really enjoy it (the flying, not the written!)