Multiple kudos for finally having an episode set inside the Tardis! I've been waiting and waiting for this with only "Doctor's Wife" giving me a brief taste. When I was a kid "Invasion of Time" was my all time favorite episode because I always fascinated by Gallifrey, the Time Lords, and the interior of the Tardis.
So was the time crack and the Tardis exploding entirely separate from the Season Five storyline, and just Moffat recycling his own ideas for the umpteenth time?
I'm so glad they actually showed the Eye of Harmony! And better yet, they showed RTD's unpublished History of the Time War book haha