The EagleTec USB Nano Flash Drive is most probably the smallest Pen drive I have ever seen. It is exceptionally small and can hold up to 8 GB of data. It has a 6MB per sec write speed. The 8GB version comes at a price of $33 while the 4 GB one costs $22.
And I thought the sony flash drive was small… This thing’s as big as the nano receiver for my wireless mouse.