Blogs:
Da Vinci Automata
Dr. Julius T. Roundbottom
Cabinet of Wonders
The Clockworkers Guild’s Journal
The Automata / Automaton Blog
Curious Expeditions

Art:
Haltadefinizione - hi-res, interactive view of Leonardo’s Last Supper
Mechanical insects
Klockworks - handmade timepieces

Misc:
Clockpunk on Wikipedia
Mechanical clockwork screensaver
Automata.co.uk - instructional site for constructing automatons
Automates Anciens - on automatons throughout history