The first time I heard about a "virtual simcha" was in the late 1990s. Detroit was hit with a massive snowstorm and the 8-day old baby boy's aunt who was to play the role of rabbi was stuck at the airport in New York. The rabbi improvised and she officiated at her nephew's bris via speaker phone.
Of course, if this happened in 2010 and not in the late 1990s the bris would have been officiated by the rabbi through Skype, and she would have seen the simcha and been seen by the attendees.
Using technology to add people to a simcha is becoming more common. An increasing number of grandparents and great-grandparents are attending their grandchildren's wedding in the virtual world.
Just last month I officiated at a wedding that was being streamed live to Israel so that the bride's elderly grandparents could "be there." Through Ustream.tv, the grandparents felt like they were at the wedding even if it meant staying up late into the night in Israel.