Via Ptak Science Books, I see that the gorgeous weblog of beautiful and/or eccentric illustration, BibliOdyssey has reached its thousandth post. "Peacay" a.k.a. Paul K, its unsung Sydney-based curator, is celebrating with a best-of list, such as Zoomorphic Calligraphy, Industrial Anatomy, The Visual Context of Music, Secret Rosicrucian Symbols and Dogs of War.
For general description and praise, see The Phantom of the Optical: An Online Illustration Trove ("BibliOdyssey gives entrée to a gorgeous and idiosyncratic gallery of rare art"), Damien B.M. English, Edutopia. There's also a book, BibliOdyssey: Amazing Archival Images from the Internet.