Here's an alphabetical list of some other sites related to magic history readers may find interesting:
Not really about Arthur Lloyd, this is a wealth of information on all things music hall and theatre.
British Magic Museum
Britain's national magic museum, showcasing a rolling selection of the Davenport family's extensive collection alongside live magic performances.
British Pathé YouTube Archive
A huge archive of newsreel footage including many early magic performances.
A fascinating digitised collection of circus and magic posters collected by Jaap Best.
A searchable archive of the contents of many magic books, good for finding specific tricks in your library. Created my Denis Behr.
This searchable archive has pages for hundreds of tricks that cite their origins, inventors and early appearances in print.
The Davenport Collection
A superb and growing resource on the Davenport Collection and wider magic history.
Lewis Davenport Ltd.
The oldest continuously owned magic shop in the world.
This huge archive includes digital copies of hundreds of early (now out of copyright) magic books, some even as free audio books.
The John Johnson Collection
Oxford University's digitised collection of 18th, 19th and 20th Century ephemera. Full of searchable magicians' programmes. Now free to use in the UK.
The Learned Pig Project
Now hosted by Lybrary.com, this is a great selection of digitised out of copyright magic books.
A private forum for magic collectors to share photos and information.
The Magic Circle
The great magic society, with a wonderful museum and library.
Genii Magazine's superb encyclopedia of magic.
Manfred Klaghofer's Flickr
Photographic catalogue of the huge Zauberkasten Museum (Magic Set Museum) in Vienna.
The Mysterious Planchette
Brandon Hodge's encyclopedic website on spiritualists' tools.
Potter & Potter Auctions
Past auction catalogues are available to download for free, providing a well photographed and described resource for collectors.
Wild About Harry
John Cox's blog on all things Houdini.
A German-language magic encyclopedia with many pages not covered by Magicpedia (above). Note: must be translated into English using a browser, such as chrome. Clicking their "English" link takes you to Magicpedia, which has different content.