If anyone is looking for a cheap micro usb otg host adapter to use to attach usb devices (thanks to DooMLord here), I ordered these from DealExtreme a few weeks ago and they just came in. Worked like a charm to mount a usb stick on my Arc. $2.20 with free shipping, no taxes as they marked it as a gift:
http://www.dealextreme.com/p/micro-usb-on-the-go-host-otg-adapter-pair-50774
http://www.dealextreme.com/p/micro-usb-on-the-go-host-otg-adapter-pair-50774