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The main things I'd suggest are:
(1) Have the OS stored on an easily removeable flash media, like a CompactFlash card or MicroDrive (which is an HD, but you get the idea). That way if you really mess something up you can just eject the OS card and re-image it using a computer and card reader. CF cards are so ancient that everything (mainly card readers and top-end digital cameras these days) can support them. 8 gigs is enough for most Linux distros, and should be enough for Android too.
It'd also (hopefully) allow you to bypass potential lawsuits like what's happening to the Nook.
(2) Have a traditional ROM BIOS or EFI that can bootload more than just one OS.
(3) Have at least one bootable USB port. As in, the user can plug in a USB stick drive and boot the tablet off the connected USB device.
(4) If the keyboard is wireless, have an option to power it from the system battery- a short two-conductor pigtail will do. Not everybody likes having to change batteries all the time and alkalines can get expensive.
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