http://ink.accio.nu/
A fanfiction archive for any stories featuring a member of a dark family (as well as dark characters/ghosts/Slytherin et cetera). All ratings; moderated. Fics do not have to be dark in nature.

http://wolfsbane.sycophanthex.com/
An archive for Remus Lupin fanfiction.

http://pureblood.sycophanthex.com/
An archive for fanfiction that involve members from the Malfoy family.

http://occlumency.sycophanthex.com/
An archive for Severus Snape fanfiction.

http://theburrow.sycophanthex.com/
An archive for fanfiction involving members from the Weasley family.

http://owl.tauri.org/
An archive revolving around Severus Snape.

http://www.glassesreflect.net/jp/sn.php
This is an offshoot of the Potter Slash Archive, focusing on the cheeky, enigmatic, beautiful James Potter.

http://slash.boywholived.com/
An archive that hosts fics that center around the protoganist, Harry Potter.

http://glassesreflect.net/psa.php
A selective archive of Harry Potter slash fanfiction and fanart. Hosts all pairings involving Harry by hundreds of authors and artists.