Not that I have actually used one but the Archos is making what appears to be a decent stab at an Android tablet. True you don't have access to the Android market, but there is it's own version and from what I have seen there seems to be quite a few apps available and I think there is an SDk available too. Haven't seen a 3G version so you are limited on the mobility, but there are many capacity choices including 500GB hard drive versions, and the prices seem pretty competative. I was toying with the Archos 5 Internet Tablet with integrated GPS to use as a carputer