Curly quotes are a particular nuisance, especially in incoming posts. This function removes them before the post (or comment) is inserted in the database. If an older post containing curly quotes is edited, it will save with straight quotes upon database insert.
I love Ozh’ Tweet Archiver–it just works, which is an awesome feature. However, a few months ago I noticed that my tweets were being scheduled instead of posted. This problem has nagged at me for awhile, and I figured it was an issue with my server (me on the East Coast, my server on the West Coast, and GMT/UTC somewhere else), until I read this comment on the Tweet Archiver page describing exactly the behavior I was experiencing.