DearS (manga)
Genre: Comedy, Romance, Ecchi, Harem, Science Fiction, Shounen
Summary: Ikuhara Takeya is a normal student attending a high school where his friends are obsessed over the alien creatures, DearS. The DearS are used as slaves and consider themselves nothing more. One day when Takeya is walking, he finds a DearS named Ren on the street. When Ren falls into the middle of the road, with a truck behind, Takeya pushes Ren to the sidewalk. From then on, Ren swore to become Takeya's slave, and the relationship gift soon grows between them. (synopsis taken from ANN)
If you wonder how it compares to anime - I haven't read it myself yet, but from what I found out, anime ended somewhere in the middle of volume 3 and manga is supposed to be better than anime (but they always say so :P ).
Volumes: 8
Story & Art: Peach-Pit
Original run: 2002 - 2005 in Dengeki Comic Gao!
Publisher: MediaWorks (Japanese),TOKYOPOP (English)
Resources: Anime News Network, Wikipedia, TOKYOPOP
Scanslated by: Korean Manga Translations, Mobots, Humanist and possibly also some other group
Release notes: I left the files in the same format I downloaded them, except for creating volume 4 from separate Mobots and Humanist releases. Since no single group did the whole thing, this is a combined release from at least 3 groups and it unfortunately doesn't have a uniform file naming pattern across releases. Be sure to unpack it with folders preserved or view it using ComicReader without unpacking, you shouldn't have any problems this way.
Props to jarudin for the torrent description template.
Related torrents: Anime: Fansub, Dual audio, OST