Google doodle history is fun. Check these out.

http://www.google.com/doodle4google/history.html

http://www.google.com/logos/index.html

They might be different outside the US. In the US we can see all the ones for Google all over the world. For example, this one was UK-only mother's day for this year:

I was very excited to see this one on Pi day, March 14:

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)