BackChannel and ChatEdit
Chatzy
TinyChat
Today's Meet
Gabbly
CoveritLive
Six Tips to Enhance Your Next Meeting (Steve Hargadon)
UStream
LiveStream
Pal Bee
FreeConferenceCall.com
WiZiQ (virtual classroom and quizzes)
For more check the microblogging page
Many of the underlying standards that define modern e-mail technology were originally developed in the 1980s. Almost 30 years after the birth of SMTP, e-mail is still the dominant Internet communication medium despite its significant limitations and increasingly anachronistic design. Supplementary services like instant messaging and microblogging have emerged to fill in some of the gaps, but virtually no attempts have been made to build a holistic replacement for e-mail. Our most important day-to-day messaging infrastructure remains intractably mired in antiquity