Talking of "surprising internal SD cards" - the Kobo eReaders use an internal MicroSD card. This makes hacking and tinkering really easy.
They bizarre and frustrating Kobo set up procedure (connect the Kobo to a computer; connect the computer and the Kobo to the Internet; download software update for the Kobo and software for the PC; set up accounts) can be avoided with a simple bit of SQL. This and other tinkering is mentioned here: http://uscoffings.net/clc/tech/embedded/kobo-touch/
They bizarre and frustrating Kobo set up procedure (connect the Kobo to a computer; connect the computer and the Kobo to the Internet; download software update for the Kobo and software for the PC; set up accounts) can be avoided with a simple bit of SQL. This and other tinkering is mentioned here: http://uscoffings.net/clc/tech/embedded/kobo-touch/