I was wondering if there's a stat sheet hiding on this site somewhere that lists what the limitations of WordPress are - what sort of usage it can cope with before it can't cope any more or starts to suffer?
For example, if someone was using a single WP installation and had 10,000 users you would expect the post editor page to struggle at least a bit as it would need to load 10,000 names in the author drop down box every time the page loads. Which would also put a lot of stress on the database as it scans it.
Is there a spec sheet that states information such as how many users or posts is the limit before a strain is put on WP? Obviously, the server will have a large bearing on any thing like this, but it would be really helpful to get some sort of idea or benchmark :)