Para aprender sozinho

Linux

http://free-electrons.com/training/intro_unix_linux
http://linuxcommand.org/learning_the_shell.php

C/C++

http://www.cprogramming.com/tutorial.html
http://www.cs.cf.ac.uk/Dave/C/CE.html

Python

http://docs.python.org/tut/
http://opensource.nokia.com/projects/pythonfors60/
http://wiki.embeddedacademy.org/index.php/Python_for_S60_-_PyS60

maemo

http://www.maemo.org
http://embedded.ufcg.edu.br/~raul/wiki/pmwiki.php?n=Main.HomePage