Matthew Turland has come across an "interesting bug" in PHP's stream wrappers functionality - some strange 404 or 500 HTTP errors in one of his scripts.

I wrote a small script a while back that's gained a surprising amount of popularity thanks to a plug from the site that it posts to. [...] I learned that this [connection from the script] could be done with streams, I attempted to implement it in that fashion, but ran into strange issues where I would get 404 or 500-level HTTP errors rather than the response I was expected.

He eventually found the bug related to his problem (in the 5.2.x branch) but happily notes that it has been corrected and will be patched in the upcoming 5.3 (and 6) branches.

Lukas Smith has posted the second and third parts of his talk with Rasmus Lerdorf - a look at MaxClients and HTTP headers.

As promised here are the two other logs from the recent chat I witnessed. [...] Again I left the logs in their raw original way. Hope they are useful for you all.

Lukas also links to two resources he mentions in the second (third?) log about performance as well as mentioning one of the most useful Firefox extensions for web developers - YSlow!.