Not mine, but came across an excellent post by Hristo Pavlov (who unfortunately, no longer works in the SharePoint space).
It goes deep into the bowels of the threading model and the considerations one should have when designing custom code in event receivers. Just what I was looking for and handy to file in your mental file cabinet for future reference.
On a side note, I love his last post:
I am moving away from SharePoint and consulting into serious custom software development and this is my last blog post here. I wish all the best to all of you that remain in the SharePoint world.