Posted: 11/05/2013 at 16:56
I'm inclined to say, although the pic is well blurred - white spring tails, Protaphorura armata. However, there are many kinds, some jump...some don't. They kind of fit the bill with regards to the environment they like - wet/damp soil.
Google on images, see if the close-up matches what you've actually seen yourself.
I have come across the very tiny small ones in compost before, but never ones this size.