"Tune your harp, my soul, to a glad song of thanksgiving! Go to your rest rejoicing, for you are not desolate wanderer, but a beloved child, watched over, cared for, supplied, and defended by your LORD." ~Charles Spurgeon
Ok, so here is an idea, which is probably completely rubbish. When the Doctor met River she gave him the last bit of the rest of her regeneration power, if you can call it that, and that's why she didn't regenerate when she died when she was with 10. So does this mean that maybe the Doctor gets extra regenerations beause of it? Just I thought as I found out that there is only 13 regenerations per Time Lord.
+r dautzenberg Her mind v. body. THink about it, they become a new person, so the fact that he saved River, the big hair spoiler girl not like a new person, the new regeneration. Which so early in the story it would off give away that she was a Time Lord, that would had been a bigger spoiler. But anywho.