RTD wanted to blow up the TARDIS in turn left but was told he couldn't because it was supposed to be the cheap episode. I actually think blowing it up giving the doctor a new ship would be cool. I'm bored with the console room and though it would upset long time fanatics it's the last thing to be updated. if you look at the show since it restarted in 2005 there's been a few times where the TARDIS has been hit, dropped from a great height, stolen, subjected to intense heat, adrift in space. seems like RTD has it in for the blue box.
alternatively the doctor could just use the chameleon circuit and change how it looks. he did fix it just couldn't be bothered to change how it looks. be quite cool if he souped it up so it's all sleek and futuristic.
just read that the actual finale episode is going to be 65 minutes long. I expect the extra five minutes may be taken up with a preview of the christmas special and extended credits. The BBC have shoved out a couple of trailers for the stolen earth. and there's both of those and a mini clip on http://blogtorwho.blogspot.com/ for those who care to catch the spoilers.