You mentioned Arduino, the MAX3421E is available in a ready made shield:
USB Host Shield MAX3421E
Or is this what you were referring to in your previous post?
Cypress manufactures a line a USB Host/OTG Controllers:
Cypress USB Hosts
An interesting ATMEGA32 based USB Host Controller:
SIAM32 USB HC
There are also several Open Source FPGA Cores available which would allow you to implement a USB Host Controller on a FPGA.
You may want to checkout
Universal Serial Bus Organization's Website and use the product search feature:
Although it is a bit of an awkward search interface, it may present additional possibilities.
BigDog