Question about "A Practical Guide to Ubuntu Linux (8.04 and 8.10)"

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http://www.linuxforums.org – I just got Ubuntu 9.10, and I am playing around with it. I plan to make it my main OS, and that will mean that I am going to have to learn how to use it better than I know how to do so at this point. I saw a book at the store the other day titled "A Practical Guide to Ubuntu Linux," which, until I looked it up today, did not know that it covered versions 8.04 and 8.10. I looked around for a guide that I could use for the Ubuntu 9 series, but found nothing. If I bought the book for 8.04 and 8.10, will it be helpful at all to me now, or should I just wait until there is a new book for Ubuntu 9? Thanks. (HowTos)