Well I have to say this is probably to best Craftsy class I've taken. I've taken some really useful ones in the past on specific subjects (alterations, serging) but this one covered so much useful information on basic sewing techniques.
Topics covered in the class are cutting, marking, sewing without pins, interfacing and pressing, zippers, waistbands, buttonholes, and seam finishes. You can see these are all basic and frequent sewing tasks, and I think I learned at least one really useful thing on each topic, and usually many things.
I think it's safe to say that this class has had the biggest effect on my sewing habits of any I've taken, and I highly recommend it.
Oh and just for the hell of it, here are the board shorts I made. I used this pattern, which includes built-in swim bottoms.