As another anniversary comes and goes, the horror of one September morning in 2001 may pass into distant memory, but we will never forget what occurred.
In New York, four moments of silence are planned today to commemorate the precise times that two hijacked jetliners crashed into the World Trade Center, along with the times that each tower collapsed. Services will also be held in a field in western Pennsylvania and at the Pentagon outside Washington.
Online various services are planned, and for those unable to make a service, major memorials will be streamed online.
For coverage and services, visit Second Life, Ustream.tv, and LiveStation. Most major social networking services will have something to mark the occasion, so check with your preferred social network provider.
For archival footage that even 7 years later is beyond imagination, the Internet Archive has an extensive catalog of footage from 9/11 and the days following here. The Center for History and New Media maintains the September 11 Digital Archive that includes over 150,000 digital items.