The eCafé is not a tablet, it's a small ARM netbook (supposed to be called smartbook I think). 512 MB RAM, i.515@800MHz (A8); internal 8GB SSD, SDx2, USBx3, wifi N, ethernet (100 I think). And a handy little switch to make it boot either from SSD or SD1, so it's really hack-friendly. I think the CPU, RAM and IO make it well suited for a very low end NAS/Torrent/DLNA/Web/FTP server, the Pi would have struggled too much. Oh, and it does have a keyboard, trackpad, 10" screen, and 5h battery, which I won't use after setup ^^ Fully passive too. Only 150€, which is not a lot more than a server/dream plug, Efika smarttop...
The thing is delivered with a custom Ubuntu kernel, so I'll re-build up from ubuntu-core trying to add the minimum.
As for the Nook, it's really more to play around. I'm not using my Touchpad much because it is too big, though it does Web and Comics and Videos, which my 4.3" HTC HD2 w/ Android really can't display (I mean, it technically can, but it's not pleasant to use). I want to see if 7" cuts it for those, while being usable single-handed.
Next and last purchase will be a Very Big Phone, probably either a Galaxy Note (5.3") or Nexus Prime (4.7" TBC).
Then I'll be set for at least ... 3 months ? ^^