I think the following may be helpful:
- http://www.memoware.com/?screen=doc_detail&doc_id=18998&p=category^!Computers~! -> an ebook that can be opened by TomeRaider application (so can be read on Windows i think, ironically :)
- http://www.linuxtopia.org/online_books/system_administration_books/ubuntu_starter_guide/
- http://maketecheasier.com/how-to-redesign-your-desktop-the-wow-way/2008/01/10
- http://www.unix-tutorials.com/tutorials.php?os=Ubuntu
