At the risk of posting a spoiler, I didn't like the ending. It basically invalidated the entire season with Donna! "You know all those adventures you had? You know how you saved the universe? Sorry, no memory of that."

And did anyone really think the Doctor was going to regenerate? The character never regenerates in the next-to-last episode of the season: it's either in the last episode of a season (where we get a glimpse of the new Doctor) or at the very beginning of the first episode (where the previous Doctor, cough Colin Baker, doesn't have the decency to do a renegeration scene).
Though I did like the fact that all of the modern Doctor's companions were in these two episodes... even K-9 showed up!

VanishingPoint... Advanced 3D Modeling Solutions