Well, after relying solely on the Sybex book, I failed with a 500 on June 1st.
After studying again with the MS Training Kit, passed with a 700 (does it get any closer??)

There was some content in the Sybex book that helped, but I'll never rely on that publisher and in the future will JUST use it as something to fill in the gaps. I did 290 and 291 with just the Sybex and was fine. 2008 is just a different animal I guess.
Hope this information helps someone!