I have been remiss about posting my new YouTubes here - sorry! I'll try to do better.
So, this video is specifically to help the Chicago club as I teach seams at their meeting next weekend. It is the "Faster, Flatter Mattress" stitch (probably my most popular YouTube ever in its original form), but I had to change it up. The original video showed how to sew it from the knit side, and this one shows that and also how to sew it from the purl side.
Maybe you have never done this stitch - try it! It will improve your ability to get projects sewed together, and it looks very, very good. Maybe you've only done it from the knit side, and I think you'll get a kick out of how easy it is to do from the purl side.
And here it is: