Looking for more fanfiction about Rupert Giles? Here are some great places to start. Or try another list of archives.
Author-submitted archive of stories about any character played by Anthony Stewart Head.
Giles Rules Baby mailing list
Giles fiction mailing list.
Massive multi-fandom fiction archive. The search interface allows you to find Giles stories.
Fanfiction.net Giles stories
The largest and oldest pan-fandom fanfic archive site. Quality varies widely.
The Buffy/Giles Fanfiction Archive
The largest & oldest B/G archive. Used to be buffygiles.com and briefly had a partial resurrection (some stories available only on velocitygrass). buffygiles.net is the full archive & is accepting new stories.
No One Knows - Giles/Xander
Hand-selected Giles/Xander stories.
Hairy Eyeball - Giles/Willow
The Watcher and the Witch.
And some smaller archives, including some author-specific sites:
the LIST - Giles/Buffy
B/G stories by selected authors. Terrifying formatting.
A mostly B/G hand-selected archive. Its contents can be found elsewhere, but this site is particularly pleasant to read & browse.
Once More With Feeling
Gail Christison's Giles stories; mostly B/G.
Giles Fic Recs
Not an archive site, but a tagged series of story recommendations. A decent place to begin exploring the range of Giles fiction.
Tea With Lemon
A fansite for Giles' car.