Site update: I’ve added favicons and apple-touch-icons on a per-series basis. Discovered in the process you need at least two icon images—one with opaque background for the Apple icon, and one with transparency for favicon and Android web clips—and each needs to be supplied in several sizes. For my first use of his I’m using my existing Twitter userpics. Looks strange at first to see a face amongst all the corporate site icons.

Noted by Damian Cugley .