I read a ton of baby and twin books when I was pregnant with my girls but I honestly dont remember anything that any of them said. If your looking to just kill some time then reading is wonderful but nothing is more helpful then having your babies home from the hospital and using your natural motherly instincts. The only advice that I took away from reading was to keep twins on the same schedule. This is wonderful advice because otherwise you are feeding and changing diapers all day with no downtime. I wish you lots of luck!
I'm reading "Twins!: Pregnancy, Birth and the First Year of Life" by Connie Agnew, Alan H. Klein, and Jill Alison Ganon