I've split the links here into 3 main sections: fan sites (ranging from the small scale focus to the comprehensive listings / social history site), resources, and some more general sites. I do check the links periodically, but as with the nature of this kind of interest, occasionally old sites die away and new sites emerge. If you know of a site that I should link to here, please contact me.
Start with collecting digital versions of comics:
Andy Jenkins site (not updated for some time)
Bunter Zone is a small site with a lot of graphics content.
Comics UK is a well put together site that pulls together background information, cover art and family trees for a wide range of UK comics.
The Friars Club was the official site of the main (?) group of Hamilton fans; and includes some interesting articles originally published in the Friars Chronicles. It was last updated 2014 and went off-line some point in 2016. A version of the site is archived here.
The Magnet 1908-1940 has a wealth of listings and detail covering the trivia included in the Magnet each week - articles, poems, series, etc.
Northern Old Boys Book Club contains a detailed Nelson Lee bibliography (but does not appear to have been updated for some considerable time).
Tony Hiam's website is a miscellany of information, trivia, and contributions from other fans.
British Juvenile Story Papers and Pocket Libraries Index contains detailed listings (though little else) of a wide range of early British comics.
British Pathe has newsreel footage of Frank Richards being interviewed, as well as auditions for one of the Christmas shows, Billy Bunter's Swiss Roll.
Collecting Books and Magazines is a vast and well-established Australian site, covering a large number of authors of juvenile fiction, with links to a variety of associated sites.
Friardale is a growing resource of electronic Hamiltonia. Members of the Yahoo groups, Old Boys Book Clubs and others have contributed a vast number of scans of rare comics, magazines and ephemera.
Google Video has 4 episodes of the Bunter TV series online. Sadly the quality is not wonderful.
Magnet Facsimiles contains scans (in jpeg format) of around 2/3 of all the Magnets ever published, mainly those that have been reprinted in facsimile form by Howard Baker. This site sadly seems to have disappeared, but Friardale now hosts copies of all Magnets, and many other materials.
Yahoo! Charles Hamilton discussion group has a range of resources and members willing to answer almost any Hamilton question you may have. There are also Yahoo! Billy Bunter and Morcove groups you may want to join.
Whirligig TV has some photos from the Bunter TV series.
The British Film Institute's Film & Television database has details of some of the episodes of the Billy Bunter television series.
Fantastic Fiction has a simple and incomplete post 1940 bibliography, but lots of cover scans.
Galactic Central has summary details of a wide range of comics and magazines.
The Internet Movie Database has incomplete cast listings for the Billy Bunter television series.
National Museum of Film, Photography and Television in Bradford has an episode of the 1950's Billy Bunter television series to view.
A George Orwell site that includes the (in)famous essay he wrote in Horizon in March 1940 on Boy's Weeklies.
Wikipedia has entries on Charles Hamilton, some of his pseudonyms and fictional creations.