There are so many web 2.0 tools to choose from, use these sites for a quick guide to what would work best for you:

Kathy Schrock's Online Tool Guide

101 Web 2.0 Teaching Tools

Here are some of my favorite tools:

Tools for Teachers:

Screen-Cast-Omatic - use this tool to record your voice over your presentations, creating a learning tool your students can use from home

Screen-Castify - essentially the same as screen-cast-omatic but designed for use on a chrome book

Buncee - create fun, interactive presentations to share with your class

Prezi - another website to create online presentations

Thinglink - a place to link your "things," create an interactive image linked to websites, assignments, and other resources

Canva - create an infographic to share with your class

Tools for Students:

ACMI Generator - create a storyboard and a script for an ELA, History or just for fun

Animoto - create your own video or a book trailer for your book report

StoryBird - write your own book 

Wordle - create a word cloud

Fodey - write a newspaper article for a class project

Timeline - create a timeline detailing important events

Glogster - make a poster for a class presentation