It was good to get a small glimpse of the future and get some information about the gap between ME2 and ME3 (even though it assumes Anderson isn't on the Council and Shepard destroyed the Collector base).
I was happy to see my boy Anderson getting some action with Kahlee again. It wasn't much, but at least you know Anderson's still "got it"
I really liked any/all dialog between Grayson and the Reapers that took place inside his own mind. I think the book gives us more insight to what it was like inside of Saren's head during the events of ME1.
I was happy to see characters like Anderson reference Shepard a number of times, including his work in fighting the Reapers. One line I recall from the book is when Anderson was thinking of ideas to help take down Cerberus, he had the idea of using Shepard for help but realized that he was "off the grid" and probably doing something much more important.
Aria getting a good amount of face-time was also a huge plus. I was interested to see how the Cerberus-Omega partnership would work out, and it looks like it may bleed into future events (maybe even ME3).
Finally, it was also cool to see the more human side of the Illusive Man (making the decision to personally oversee Grayson's transformation, and watching that decision almost bite him in the ass - you don't see the Illusive Man making mistakes like that). Also, the revelation of Aria losing her daughter also showed us a different side of this "ruthless Pirate Queen" that you may/may not have expected.