Growing the Beard: Considered to be this for the revived series in general. Eccleston was a great Doctor, but in the previous episodes, most of the the monsters were of the quirky and wacky sort, save for maybe the Autons. Here, he faces the most iconic monster of the show, and takes the Darker and Edgier aspects of his personality Up to Eleven. This is the episode that cemented the reputation of the revival series, and it hasn't looked back since. Some people even said that it wouldn't be Doctor Who without the Daleks, and that this episode made the Daleks "scary" again.
There is mention of a meteor landing in Russia in 2013. Fast forward to 2013 and...
There's also his remark about owning the internet. Fast forward to 2012 and SOPA, and it nearly became a reality.
Some Anvils Need to Be Dropped: Though the choice of the Doctor and a Dalek for this moral is questionable, the idea that turning to merciless violence as a means of combatting a hateful person will bring you down to your level is one that is delivered exceptionally well.
Strawman Has a Point: The Doctor wanting to kill the Dalek and wipe out their species is portrayed as bad, except he knows how dangerous the Daleks are, which is aptly demonstrated in this episode when the Dalek kills hundreds of people, and the Dalek makes it quite clear it wants to wipe out humanity. Rose tries to give the moral judgement, except she doesn't know about the Daleks, so this is out of ignorance. Later, she is terrified of the Daleks and shows no remorse on wiping them out (apparently).