Reforming Project Management Theory and Practice [1] by Hal Macomber has a nice tip about
to eliminate Multi-Tasking to Speed Project Completion :-)

I guess I'am also the guy of reading 5 books in parallel ... and enjoy it to lay down a book when it starts to stress my mind or other interests I want to read about... typically the parallel books have different conjuctive topics...

But the comparison is great to keep in mind for the next project plan / team meeting...