I’ve updated my main test server that runs Snow Leopard and I haven’t noticed any strange behavior or errors, when looking at the usual suspects (like postfix and it’s configuration).

If you want to read more on what is affected in the updates I would suggest reading the Apple support site for the (security) update. It’s mainly fixing a problem with AFP which is not something we use.

I will update more machines later on, I only had time for one now, but I didn’t want to keep you all waiting too long.