Hornblower fandom on LiveJournal is mostly involved with the A&E/BBC adaptations of the C.S. Forester novels. Book fans participate, but most of the activity is centered around the movie versions of canon.
Some canon history and terminology that might be helpful:
There are 11 books about Horatio Hornblower written by C.S. Forester, following his career from midshipman to Admiral. There have been two screen adaptations of the Hornblower books - the first is a 1951 movie called "Captain Horatio Hornblower R.N." starring Gregory Peck as Honblower. It is still shown occasionally on cable TV in the US (and I assume in other countries; though I do not know that). BBC and A&E showed 3 sets of miniseries, the first being a four part adaption of the Midshipman Hornblower book. This is commonly referred to amongst fans as HH1. The second adapts a storyline from Lieutenant Hornblower in two parts, and is commonly called HH2. The third (also two parts) loosely adapts part of Lieutenant Hornblower and Hornblower and the Hotspur and is called HH3.
Archie Kennedy is commonly referred to as "the Crumpet" in fandom, and his fans are the Crumpeteers. The nickname started with this fic, and has taken on a life of its own.
General communities and fandom overviews
Fandom overview at the Crack Van recs community.
Fanfiction and character-specific communities
Past fanfic recommendations from Crack Van.
Actors
Icons, videos, and graphics
Hornblower moodtheme by
Pellew moodtheme by
Some non-Hornblower-specific Age Of Sail communities and information
Selected non-LJ sites
scaryfangirl.com - comprehensive Hornblower fan site
The Horatio Hornblower Fanfiction Archive - the archive for the hhfic mailing list. No slash.
Hornblowerfic.com - an automated archive
A&E's Hornblower discussion forums
Let me know if I've missed or misstated anything.
Last Update: September 13, 2009.