Keir Thomas has put together a nice book and made it available for free (pdf format)!

If you’re looking for a nice Ubuntu guide/reference book, you should check this out!

It’s free, so what do you have to lose?

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Free Download —> http://www.ubuntupocketguide.com/download_main.html

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If you appreciate Keir’s work and/or want a hard copy, you can also buy a print version for about $13 here: http://www.amazon.com/gp/product/1440478295?ie=UTF8&tag=beginningubun-20&link_code=as3&camp=211189&creative=373489&creativeASIN=1440478295