For the last few months, we've been reporting Google SERP changes as has been observed by the WebmasterWorld community. We haven't been able to locate a list of archived threads, though -- until now.
Tedster has shared a list of WebmasterWorld Google SERP changes posts. The cycle begins in December 2006 and has continued pretty tremendously through today.
If Google history is an area you'd like to explore, be sure to check out the archives and feel some nostalgia.
Forum discussion continues at WebmasterWorld.