Looking back one, two and five years ago today on Worldchanging:

2009
Inclusive Planet: Planning Internet Access for the Differently-abled
Dina Mehta nominates Inclusive Planet as part of Worldchanging's Attention Philanthropy Campaign; find out more about Inclusive Planet's work to create innovative online services for the differently-abled with the vision of leveraging these services to building a community on the web...

2008
Do a Little Dance, Spread a Little Love, Get Down with Matt Harding
If you haven't ever seen it (heck, if you haven't seen in recently!), it's worth watching "Where the Hell is Matt?"...

2005
The Sensor Web
NASA is set to test a new project they call the "Sensor Web," combining data from multiple sources to build a more complete picture of atmospheric pollutants...

Other recent "look backs":
July 6
July 7
July 8