Audio/Video

General

• EyeJot - video messaging
• Omnisio - video or video w/ ppt sharing and commenting
• Skype - text, voice, video messaging
• TokBox - video email and messaging, video chat
• Utterz - text, voice, video messaging
• Vaestro - threaded voice discussions
• Viddix - interactive video and multi-media presentation tool
• Viddler - online video web cam capture with text and video commenting features
• VoiceThread - multimedia presentations with text, voice, and video commenting features

Podcasting/Vodcasting

(for step-by-step, see my podcasting workshop materials or check out 70+ podcasting tools for other cool stuff)

• GCast - audio podcasting via phone-in or uploading audio files
• CrowdAbout - interactive podcasts
• GabCast - audio podcasting via phone in or VoIP recording features

Screencasting (overview)

• Screencast-O-Matic - an online screencasting tool

Online Video Editing (overview)

• coming soon

Presentation Creating / Sharing

• AuthorStream
• MyPlick
• Preezo
• PrezentIt

Blogs/Wikis

• PBWiki
• WetPaint
• Blogger
• NoteMesh - a wiki for college students to collaborate on course notes
• Twitter - a microblogging tool

RSS Readers & Start Pages

• Google Reader - reads text and multi-media feeds

• Start Pages Overview - tools to create multimedia resource collections

Online Classrooms

• WizIQ - full-featured classroom with synchronous and asynchronous capabilities

Instant Messengers & Similar

I'll be adding to this list shortly. In the interim, read Nine Strategies for Using IM in Your Online Courses

• EyeJot - video messaging
• Skype - text, voice, video messaging
• TokBox - video email and messaging, video chat
• SnapYap - video email and messaging, video chat

Interesting Tools That Defy My Current Classification Structure!

• xTimeline - create timelines online and embed them in your web page
• Notely - a student portal for course notes, files, schedules, contacts, and more
• Annotate - annotate web pages or uploaded PDFs and MS Office documents