You can use Diigo to create a bookmarking site online for your students to access. Go to the Educator Accounts FAQ (http://help.diigo.com/teacher-account/faq) for more on Diigo in the classroom.
Edmodo is an online, safe, educational website that you can use to set up classes. The layout is very similar to Facebook and is completely private, safe and free. There should be a link to edmodo on the Diigo Indian River Group. There is another site called Classroom Collaboration (also a link on the Diigo Group) that can be used for classroom discussion online.
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Complement classroom instruction and encourage students to use online tools with Collaborize Classroom.
FREE online discussion tool WITH Teacher Resources including how-tos and Dos and Don'ts of online discussion.
Embrace the backchannel (what's going on in the room while you are presenting).
Create a "room" where the audience (your students) can ask questions, make points, get clarification and allow you to tailor what you are presenting to meet their needs.
Create, share, edit using Google Docs. Great uses for the classroom including collaborative writing, presentation & spreadsheet creation.
This presentation by Tom Barrett (http://clifmims.com/blog/archives/2613) from Clif's Notes (a great ed. tech blog from Clif Mimms) shares ways you can use Google Docs to collaborate and create online.
Narrow search results to include reading level, language and/or file type.
Great idea for a synthesis activity: Have students find a PowerPoint presentation on a topic they are studying. Then, have them modify that PPT and have them give a rationale for their modifications.