Can't stand behind: An Apollo 11 tribute
The Internet is overflowing with Apollo 11 coverage... a good summary is at TechCrunch. I would like to add the trusty BigPicture who was a few days ahead of schedule with great pictures. Most interesting tribute for me was the CAPCOM Twitter experience, which recreates the landing in real time using tweets. Browsing through all of the material that is available, the picture of the astronaut on the surface of the moon represents the essence of the accomplishment to me.