My list:
1. Let the Right One In
2. Shaun of the Dead
3. The Host
4. Sweeney Todd: The Demon Barber of Fleet Street
5. Drag Me to Hell
6. Trick 'r Treat
7. Grindhouse
8. 28 Days Later...
9. Zombieland
10. Audition
Honorable mention: The Descent
How about you?
(I was writing a long answer and it got deleted...)
I recomend:
[Rec] (2007)
http://www.imdb.com/title/tt1038988/
1. Orphan (2009)
2. The Ring (2002)
3. The Others (2001)
4. Drag Me To Hell (2009)
5. The Orphanage (2007)
6. The Texas Chainsaw Massacre (2003)
7. [Rec] (2007)
8. Let The Right One In (2008)
9. The Descent (2005)
10. Saw (2004)
Assuming the quotation marks weren't implying any special meaning and OP meant decade and not millennium, but we'll likely never really know for sure. I'm just a sucker for list threads and OP's first three. US titles, more or less in order.
Inside (2007)
Let the Right One In (2008)
American Psycho (2000)
Shaun of the Dead (2004)
The Living and the Dead (2006)
Noroi (2005)
Splinter (I) (2008)
Ginger Snaps (2000)
The Children (2008)
REC (2007)