I'm not sure how I missed this, but Nick Tumminello published an article with a variation of the Pushup Plus.
The regular "Pushup Plus" is just holding the top end of a pushup and performing a horizontal scapular "shrug."
Nick's variation is slightly different, but it adds a nice touch to the movement. I've been doing these regularly in order to keep my shoulders healthy; I've started doing Nick's variation instead at the suggestion of a fellow trainer. If you're doing the regular version, try these for a bit.
Pushup Plus Exercise - A Better Way"
2 hours ago