I wasn't sure whether to put it here or in the "Share Your Badassity" board but wanted to share on MMM in case anyone else has (or eventually has) this problem.
My box spring was really getting bad. It's only 10 years old, and appeared in great shape, but the volume level of squeaks were getting close to unbearable. ...To the point where I began to get worried the neighbours would start to complain and where I was embarrassed if I had to go there with a ladyfriend. (Hey, it happens occasionally.) One overnight ladyfriend even commented on it.
I was resigned that I'd likely soon have to get a new one and wasn't looking forward to it.
Then I watched this guy's video:
https://www.youtube.com/watch?v=0YIzMPil138I was disappointed when I removed the bottom fabric and saw mine looked a lot different inside but I slathered loads of glue between all the board joints anyway and gave the metal bits a very light spray of WD40. I didn't hold out much hope but now it doesn't squeak at all! It's actually weird to get used to a totally silent bed. I guess all the noise was coming from wood rubbing against wood.
So, there you have it--for about $1 I saved myself buying a $200 new box spring. (In a case where I'm sure the majority of the population would have gone out shopping.) :)