Depending of the (new and beautiful) official documention: "The page_title tag is a single tag that displays text depending on the context it is used. Its primary purpose is for outputting information suitable for the HTML <title> tag." (Source: http://docs.textpattern.io/tags/page_title)

The first occurence into the meta title is very important for Bots. Current tag always shows the site name first. Sequence into the <txp:page_title /> tag could be improved a bit by putting the site name at the end.

So, we'll get:

• on a the home page: Site Name
• on a section page: Articles · Site Name
• on a category page: Current Category · Site Name
• on an individual article page: Article's Title · Site Name
• on a search results page: Search results for: {q} · Site Name