This is a icon replacement for a utility called Lanlight that can replace/implement the network activity that was previously available in Windows XP and Vista.
So far I haven't seen one that matches the look of the new Windows 7 as much as this. When the incoming or outgoing is idle it is transparent on the screen area.
To use this you must first install Lanlight which is not my program. When looking for Lanlight online it may be called LanlightNTF as it was originally written for Windows NT. The installer will come in at around 1.89Mb.[link]