Scott Johnson has also posted his slides from his talk at this year's php|tek conference covering the scaling of the Ookles site using PHP.
Kudos to Marco Tabini and associates (Sean et al) for pulling together php|tek. I just finished up my talk (and they even let me make a podcast of it which I'll post shortly) and I had a great time. A very smart audience and my thank you to all of them for their many questions.
Here are my slides. I need to lightly edit my podcast so that won't get up for a few days but this is a start: PDF File of "Scaling Ookles".
You can get more information on the upcoming Ookles from a good Google search for the time being.