To help promote Russell T. Davies book The Writer's Tale, the tie-in website has made six Doctor Who scripts RTD wrote available as .PDF downloads. The free scripts are for "Voyage Of The Damned", "Partners In Crime", "Midnight", "Turn Left", "The Stolen Earth" and "Journey's End".
Needless to say, these are invaluable for aspiring screenwriters to study and dissect. I'm sure Doctor Who fans will enjoy reliving the episodes in written form, too. I haven't actually read any myself yet, but I assume there are no big differences between the page and what ended up on screen (these are shooting scripts, after all). But, let me know if you spot any interesting deviations or line changes.