Its the Manhattan 28 port hub.  

http://www.amazon.com/gp/product/B0074024XU/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1

A little pricey but it seems to be working pretty well.  It has an on/off switch for each port which has been helpful since cgminer support seems weak right now for these units.  If i start CGMiner with all my units on, CGMiner crashes.  But if i start CGMiner with all the USB ports shut off, then turn them on one at a time, CGMiner will pick them up as i turn them on.  I have 40 miners running on one Windows laptop right now.