Sara Golemon has posted her own look back at the year of 2006 in the PHP:
Well, Davey Shafik started us off with his year-end wrapup so I'll follow suit with mine. The thoughts below are mine and mildly influenced by alcohol. They represent a foggy review of how I experienced the year through the imperfect recollection of mailing list archives.
She covers each month, looking at the people, events, and releases that happened in each. Lots of activity happened on the mailing lists mirroring the happenings in the rest of the PHP community. Check out her great post for the full happenings of the year.