Unlike some others here, I'll avoid the temptation to make a "Gold" joke about this. :)
The revived Doctor Who's third series (the 2007 one) is represented by this soundtrack. It contains a little beyond the third season, it has a song from the Dec 25, 2006 Christmas episode, as well as the Dec 25, 2007 Christmas episode (which at the time it came out was before the story had aired). This soundtrack, like the other one was done by composer Murray Gold, who has handled all the music for the new Doctor Who.
It's turned out to be fabulous. It's orchestral unlike the old series. That could be down to budget, but the old show's music never sounded like this, and I'm convinced it's a large part of the overall feel of the series now. There's all kinds of things on here. There's a few actual songs (with lyrics), but most is soundtrack stuff - and it's really good. As with the series itself, the third series (29th overall) soundtrack is better than the stuff that preceded it.
If you were a fan of the 2007 series of Doctor Who, then you should be all means check it out. I know lot a lot of people like listening to soundtracks (mostly because of there being no lyrics), but this is fantastic! Even my two year old loves listening to this, and she's never seen the show! When track 2 comes on, "Hey, it's Martha's song!"
One minor nit, though.. The show tune number from the Dalek episode "Daleks in Manattan" is here (My Angel put the Devil in Me). Unfortunately, it's not the original version. The woman who sang the song from the Christmas 2007 episode sings it here (Yamit Mamo), and while it's a good version, it's not the original. I really wish the original version was on here instead.