Live illustrations, step-by-step instructions, and video demonstration - Final products perhaps aren't as glamorous as Pageflakes or the like, but you certainly can make-do without another account/sign-in if you already do Google.
Introduces Diigo: lists suggestions for using Diigo in education from discussion with Clif Mims on why teachers and learners would, should could use Diigo, and diplays annotated screenshots showing how to activate and use Diigo functions