What are some of your older posts/threads that make you shudder today and/or that you regret making?
Most of them. Also, while I love many features of the new layout/format, like the ability to paste in formatted text, the auto-save (I can't tell you how many posts I spent forever writing were lost because I hit backspace and it acted like a button or similar problems), the upload feature, etc., the change meant that punctuation and special characters in older posts now show up as character code references.
But if I had to pick, there is one that stands out. I don't remember what it was about. All I know is that I tend to post here when I can't sleep and too frequently after I've had a drink or 2. In other words practically the only time I am likely to not just get upset but act like a child and complete jerk. One day I had spare time during the day for whatever reason, and I went on the forums. I usually check the post I have already participated in first (which is even easier now thanks to alerts), and did so. I was scrolling through and found a post that, even though I was level-headed, was so obnoxious I started replying before I'd read through it all. As I continued to respond to the points made, I began to grudgingly admit to myself that, despite my distaste for the post, I actually agreed with the points made. Eventually, one of these points was made in a way that sounded quite familiar.
Turns out I'd written the post like 2 nights earlier and had forgotten it completely. I hadn't bothered to check who made the post before starting to respond, and as I often did before the forum changed I had copied the post, pasted it into word, and was writing my response there (doing this ensured I wouldn't loose the post by accidently leaving the page or a failure when submitting).
So there I was, half-way through my rebuttal to this member's obnoxious tirade, once again thinking to myself "you know, you really should stop visiting the forums when tired and stressed (especially if you've been drinking)."