A real working TARDIS in Minecraft. At least in terms of the teleporting, that is. You'll have to figure out time travel on your own.
You can program up to 28 (if I counted correctly) possible destinations into the command block matrix, and those locations can be selected from inside the console room. If you don't program it, all of the destinations default to spawning an outside on your inside, so have fun with that.

Features:
Console Room - levers to select the destination, one button to check where you're going, and one button to go.
Non-Euclidean hallways - doors don't always take you where you might expect
Sound Effects - faint pulsing hum throughout, louder in the console room, even louder when de/re-materializing; materialization noise possibly audible to those outside of TARDIS as well, but not tested
Visual Effects - lights flicker and world goes wobbly during teleport
Exterior Teleportation - the phone box disappears from one place and shows up somewhere else; using the front door works exactly how you would expect it to
Respawning - to ensure the TARDIS is always loaded, it sets its center as the worldspawn; if you die you'll wake up just inside the front door
Reset Button - underneath the main console are a couple of rooms that help everything work smoothly, including a button that restarts everything if you screw up; it won't fix any problems caused by placing or removing blocks or by changing command block commands, but it'll at least restart all the under-the-hood functions

To Do:
Other rooms - currently just the console room and some hallways, I'd like to add the library and some other rooms as well
Schematic testing - I'm not sure how portable the design is, I'd like to try it in multiple worlds and make sure it doesn't go too screwy
Multiplayer testing - there's a lot of functionality I have no way of testing until I can get someone to hop on a LAN server with me
Programming Guide - I don't imagine it's very easy to figure out how to get this thing to work, so I'll try to put up a guide of some sort as soon as I can
1.9 Update - my main priority is to change things to take advantage of the new command block features. I'll leave this project up as a 1.8-compatable version, but any future work on my part will be on a 1.9 edition.