@JamesC4S - yes, there are I'm getting a thing called an ePad that not only has USB host, but also comes with an USB to Ethernet adaptor, 10 inch screen and cost 160GBP (200 USD). You can plug keyboards and the like in.
I found it on Amazon marketplace - pick some keywords out of this: 1 of 10" Android 2.1 ZT-180a 1GHZ CPU 256RAM Apad / ePad / Ebook reader WIFI Tablet PC + Free Gifts worth £24 BY DIGIBITE [ASIN: B004B4ATA2]
I doubt the build quality will be up to much, but at that price, it would be rude not to.
I am interested too but my ereader/tablet is pretty darn cheap ($100USD). It has an ADB interface so maybe it is effectively able to transfer serial over USB?
Amarino looks good! and I will probably have a go as I have got a bluetooth module just waiting to be played with. However I still want to see if I can get a hard USB link working.
Still no Android pad, and the eBay seller is not responding. Humm...
My wife has an Archos Android tablet that is supposed to have USB host. I didn't try the host mode so far, but I'll try.
I did try it on the OpenmokoFreerunner last year. The kernel it came with, didn't recognize the Arduino's USB chip.
Rebuilding the kernel for the freerunner would probably be easier than for an Android Tablet.
I finally got the tablet. I plugged the Arduino board in, openned a console and typed:
ls /dev
Which gave me a bit list of devices. I was hoping to see a device name with FTDI in it, as I get on my Mac. Sadly it was not there. I have no intention to start trying to learn how to rebuild kernals to include drivers for the FDTI chip.
So, I have got an Uno on order now. Which, as I understand it, does not need a special driver. So, I'm putting it on hold until that arrives, which I think has a much greater chance of some success.