I mentioned in another post that we've switched to English Grammar Revolution's Get Smart grammar program. I wanted something that was not teacher intensive, and also included diagramming. I wanted to be able to use it with all the boys. I didn't think I'd be able to find something that suited my requirements, but this program certainly does.
We're a couple of lessons into this program, and I've got to say, it's super easy to do. Nearly all of the 38 lessons has a video lesson of Elizabeth (the program's author) teaching the concept. There is a Student Edition, which is a worktext to print out. The worktext begins with a lesson, and following the lesson are 5 sentences to diagram. You can move as quickly (diagram all 5 sentences in one day) or as slowly (diagram only one sentence a day) as you'd like. We watch the video, read the lesson, and diagram one sentence the first day, and then for the next two days we diagram two sentences, so each lesson is taking us 3 days.
One thing I really appreciate about the program is the "Key" Elizabeth has for each sentence. The student is required to break down the sentence and label each word or phrase. This has been wonderful for helping the younger boys diagram. I also love how the concepts build on each other. And? I love that it takes less than 10 minutes a day.