I use soap nuts sometimes! Haven't for awhile because I can't get to them (shakes fist at Rans for storing random crap in the laundry). I can see why people wash just in water, our washing machines are heaps better these days, and I reckon water and agitation are enough probably. They're definitely fine for clothes. For nappies...mostly good, depending on where your baby's at. I would alternate between the nuts and detergent for mine, because teething sometimes needs that extra something to get rid of smell.
They're good value as opposed to detergent though I think...they last a long time. (Just do the bag up tight, I double knot, cos you don't want soap nut through your clothes!)
I think I got my sample from The Wee Wuns, and you know, to justify the postage I got some other stuff at the same time, some Envirosax (love mine), and...can't remember what else.

Ohhh Mel, that sounds like a MESS! I'm not sure we've ever had a blocked toilet, doesn't sound fun.

Rans had Riv in one of my bikini tops over his jumper during dinner tonight. They crack me up.

Maz, I will take your 8 year old and 6 year old, if you will take my almost 2 year old and almost 5 month old. GLAD they're in bed today!