Just saw http://www.nichum.com/ launched on a jewish yahoo group. I can see niche sites like this popping up to bring together people from all over the world who can't make it to a funeral. As baby boomers get older I'm sure these sites will gain some traction.

On a happier note, take a look at http://onlysimchas.com/ It's geared towards Jewish family celebrations - births, bar/bat mitzvas, engagements, weddings, and bdays. I know plenty of people who check it on a daily basis to track their friends and community.