Cool & Odd - wasn't even sure if it was an insect or some kind of fungus but lifted the posterior end up slightly & saw tiny legs moving to re-grip the twig.

1000 eggs in that big white sack! Moving to guide. We need a date on this image for the data map - can you provide one? And was it on an indoor or an outdoor plant? We've had a report of it in a greenhouse in Massachusetts, but if it's outdoors in GA that would be more significant.

It was on a Memosia Tree.
Found yesterday 28 August, 2006.
I don't want these things to kill my tree now . . The Memosa is my Humming Bird Sanctuary - a bunch of them buzz around it like bees in the summer.

For the host, a bunch of different plants are sometimes called Mimosa tree, but I'm guessing you're referring to Albizia julibrissin - please follow the link to confirm.

Albizia julibrissin is what I'm referring to as Mimosa (I've heard it called Formosa).

Very common in the S.E. As noted above this is a wonderful attractor for Humming Birds and a number of nectar sipping Lepidoptera. I have to do some research on the effects & control of Icerya purchasi.
I don't want to take a chance of pests killing my Mimosas (I have seen scale insects kill large bushes) - hopefully we can co-ordinate a living arraingment . . .
--------------------UPDATE-------------------
I should note: these insects are frequented by many tiny (1 mm) ants. There are usually several clustered on the anterior end and several always moving to and from the insect. I'm assuming this is a form of co-habitation similar to ants "milking" aphids. Possibly getting a secretion of nutritional value from the insect.