This is cool … just seeing a discussion of unschooling and CM!
I love them both and have commented or advocated for them on here before in my posts or responses. I think they blend beautifully as long as you can relax a little on both. At least that has been my experience so far. If you are a person who is very rule bound or schoolish (enjoy the feel of planned curriculum and school like environment or hours) then it’s probably going to be hard to accept the premise of unschooling or of blending the two philosophies. However, the rich choices of a CM education really open themselves to an unschooling enivronment. i was made espcecially aware of this after reading some of Charlotte’s own writings.
I don’t think I’d ever be able to totally abandon all structure for a radical unschooling approach. I have found it works best for my children if they are involved and interested in what they are learning. And if there are reasons behind learning it too. Learning just for the sake of test taking, or someone else’s idea of what’s worthy doesn’t fly with us. Luckily there is an endless supply of information out there to be learned and investigated!
The forum here tends to focus on schedules and plans a lot, but there are those of us on here who are following a much more relaxed form of CM that still accomplishes or mirrors the philosophy of a CM education. They just tend to be more quiet! 
I do want to mention something that has now happened to me in two states in regards to unschooling groups/forums/etc – I’ve thought that my relaxed approach to unschooling would be well accepted and so I’ve tended to jump right in with those folks and declare our family sort of an unschooling family. Whoa! Did I ever meet with resistance (and I use that word over other harsher words I could use) to our version of unschooling. I was told on several occasions that “you are not unschoolers!” Apparently I’ve yet to find the unschoolers who have room for those of us who are not radical or who might adopt a variety of philosophies and approaches. I’m still searching.
Interestingly enough, when I read John Gatto’s work (which many think of as an unschooling approach) I did not get this extreme veiw of unschooling at all. In fact I got something very similar to what you are attracted to and what we practice. A respect for the child as a person, a respect for learning in all its forms and fancies, a turning away from the popular culture behavoirs and mentalities and a real push for “real life” learning in practical and meaningful ways.
I had the same experience with Mary Griffith’s book – the unschooling handbook – too. Not a lot of “don’t do anything, ever that resembles school or blatant learning” but more of an idea that there is so much wonderful learning out there for our children and that we should think of everything we do every day as what it is: learning. Everything we do teaches us something – small or large, important or unimportant.
I think we do this most effectively and best when we determine for ourselves what the “goal” is and then, keeping that in mind, walk forward with baby steps being unafraid to go backwards, swing around, do a square dance and come full circle on occasion!! Really our attitude as parents and as learners goes a long way in how our children approach their educations. If we are happy, enthusiastic and rearing to go … how can they not follow suit (most of the time anyway!)?