What is this little white creature?
It is, as stated by @rg255 a seed (or actually a fruit, see below). The seed itself is the small brownish thing. The white hairs are attached to make the seed fly with the wind. Looking at the seed and the hairs, I think the seed belongs to the daisy and dandelion familie asteracae/compositae. Altough there are other possibilities, see comments.

EDIT: 
@AlwaysConfused is right if he states that in case of daisy family, it should be called a fruit, that containes one single seed. To be more precise, it is an Achene/Cypsula. In many species, what is often referred to as the "seed" is actually a fruit containing the seed. The seed-like appearance is owed to the hardening of the wall of the seed-vessel, which encloses the solitary seed so closely as to seem like an outer coat. Info derived from here on fruits and seeds and more specifically on Achenes/Cypsela here