I see what everyone means by some of the emotional value being lost (for example, obviously a photo of me in a green dress on the beach loses some of it's WOW if I black and white the beach and sky and green dress... or, when the shirt Zach came home from the hospital in was a Red M&M shirt, it would lose some of it's oomph or emotion if I turned it black and white), but at the same time, since I take so many shots at an event, even if I do make them black and white, there are certain to be other pages in the album featuring photos from that day/event/etc in color. :shrugs: It depends on my mood, but I've been using black and white more and more.
And, in some of them, I actually feel like the black and white helps convey MORE emotion for me than the color version of a photo.
To me, from the very second I took the photos, I knew that I'd love to use them in black and white. I *could* use the color version, but the B&W speak to me more.
In this one, he is wearing a bright red and blue sleeper. It doesn't match the kit at all. Someday, I may scrap the photos in color using a lego kit because it's from a series of photos of he and Jeffrey playing with Legos, but honestly, at this point, it's just a cute photo as-is, and I don't need to see the color detail- I have a billion pictures showing off his blue eyes, probably about 100 of him in that particular outfit, and plenty featuring the dusty mauve of my grandmother's chair in the background. Those details aren't as important to me as his expression, and because he was in motion when I took the shot, it's not completely in focus-- the B&W adds a little poignancy to an otherwise "eh" shot.
I left these in color because his outfit matches the kit perfectly, and I just didn't like the black and white versions as well. I felt like the kit captured the colors well, and I felt like he just looked perfect and cute in the shots in color. Shots like this will help me remember exactly how his eyes looked as a baby, how smooth and clear his skintone was, and how blonde his hair was.
I think a good mixture will still tell the story, for me personally, but it's all up to personal opinion!