The Archos 5 Android Tablet is powered by Android but lacks the Google Apps that 'with Google' devices come with. You know, the apps that make Android even better. Luckily, the hacking community has found a way to make those apps--Android Market, Google Maps, Gmail, Google Talk, and all the other Google Apps on Android--available for download. Given the larger screen size of the Archos 5, you may run into some wonkiness but it looks to have everything in working order.
If you're interested in downloading the Android Market and the Google Apps onto your own Archos 5 Android Tablet feel free to head here for the instructions.