You are most likely looking for Hugh Crawford and Betsy Reid's digital version of Jamie Livingston's 'Photo of the Day' project.
There is also a new version of the project that is presented the same way as the show was hung at Bard College in October of 2007. It is in four parts, showing each year horizontally with each day of the year vertically, and the photographs can be made larger. Zoomed in all the way the four parts would total about 16 feet by 250 feet.
It is presented using the same technology used for Google Maps by the nice people at Carnegie Mellon University and Google. Read about it here