I've pretty much finished Shroud of Sorrow now (have 2 chapters left). And have to say that the chapter I read last night was absolutely brilliant. I'll put it in spoiler tags but it seemed so appropriate with the 50th Anniversary year:
[spoiler] The author takes us through flashbacks of the Doctor's life where he says goodbye to lots of the companions, (Susan, Jo, Sarah Jane, Adric, Peri, Captain Jack, Amy and Rory, Astrid, etc. but it was absolutely brilliant. [/spoiler]
I would thoroughly recommend picking this one up if you haven't already!