so i just got my 5 500gb today, been reading the forums figuring out if this device would suit my needs, obviously having the google apps (market especially) was key. So this is the first thing i did other than update to 2.0.38. The apk works great, but getting the market to work was a lil tricky. First time i installed the market4archos.apk i setup my google account and gmail worked great. could open market, but if i tried to download anything nothing working. So i went in to manage apps and cleared the cache for market and tried to uninstall updates (it failed to remove updates) then i went through the market4archos to remove the apps, rebooted then started over. The steps below seemed to get it to work after that whole mess.
Connect to your wifi
install the apk
open market first
go through the google account sign-in/creation
and then the market came up (after the agreement) and worked fine.
It is the older version of the market, so i'm waiting to see if the market updates and continues to work. Hopefully it will, and hopefully this may help someone else out.
Thanks for all the hard work on this device. As an avid android phone geek, this is an awesome alternative for something with a lil more storage and power to play with..
Edit: Just picked up my device again, market is updated and working properly.. Yay!