Hi Paco,
To answer your questions....
1) The password is/should be set up by you the first time you set it up. You should be able to turn on the password prompt when the screensaver kicks in by going to System->Preferences->Screensaver (choose Lock screen) The system also asks you if you'd like to encrypt your home directory as the step when you enter your name, computer name, username, password, and other options (like login automatically, require password, or encrypt home directory (encrypting home directory requires you enable require password))
2) Updates are pushed out via packages.efikamx.info; this should be listed in /etc/apt/sources.list.d/packages.efikamx.info.conf (I believe is the file name, I'm not near my Ubuntu smartbook at the moment) Updating it is the same as on any other Ubuntu machine, when updates show up, the Update Manager pops up, or you can run apt-get update && apt-get upgrade. Please note that currently we're based off Maverick which doesn't get updates as often, except for security updates.
3) Gnome was chosen for it's user-friendliness. You can use whatever you prefer, however you will need to ask on the forums if something doesn't work, and hopefully someone can assist. We do all of our testing on a Gnome based system because that's what we decided to officially support.
4) Unfortunately, there is no way to disable tapping while typing.
5) We are working on getting some things available. I personally use a bag that I picked up at the local Wal*Mart near where I was living for 20 bucks (any 10" netbook case will work); Mine is a Wenger/Swiss Gear. It's at least a year old now, and looks as new as the day I got it. (
http://www.walmart.com/ip/Swiss-Gear-Le ... e/16685819 is the exact one I got, but it looks like the price dropped to 14 and it's not available online. If you happen to live near a Wal*Mart they might have one in stock, but really, anything 10" will work) (While I work for Genesi, that isn't an official endorsement, it's just my own personal one. This is a sleeve more than a case, so you wouldn't be carrying the smartbook and it's AC adapter in it.
6) If you look at the trackpad, there are 2 white "tack" marks on it, the one on the right side is the right click.
What type of documentation are you looking for? If it's just a general Linux type, then most things from websites work (just keep in mind that this is an ARM processor and not x86/x86_64, so some applications might not work the same!)