Pew Internet has maintained a category dedicated to digital library trends for a few years now, so the site hosts a reasonable volume of material. It also includes a blog. The new site’s About page is unfortunately a copy-over from the main website; but with any luck, someone will add that background context soon.
If you don’t regularly visit Pew’s work on Internet trends, I highly recommend it. And for the law library crew here at Slaw, a new dedicated section on library trends should make accessing these materials a touch easier.