Here are further resources about paperless classrooms:

TeachPaperless blog Shelly Blake-Plock writes an excellent blog about teaching without paper and progressive teaching in general.

Marking Work in Google Docs Excellent blog post by Tom Barrett explaining a system of how he marks papers in Google Docs and organizes them

This school site contains a spreadsheet with many educators sharing how they use Google Forms in their classroom

Probing the Prospects of Paperless Pedagogy K12 Online presentation by Jason Neiffer

Why I believe Printers were sent from Hell

Pledge to go "paperless" for Earth Day

Tom Barrett has crowd-source a series called "Interesting Ways" where teachers from around the world have shared how they use on-line tools in their classroom. It may take some time to load because there are around 30 slide shows to load on different topics and tools.

This school site contains a spreadsheet with many educators sharing how they use Google Forms in their classroom.