abt xsl:fo

Hi
I have been seing a lot of posts regarding xsl:fo
I do not know anything about what its used for..i do not know if using xsl:fo 
can anyway better my work.
I wanted to buy Dave Pawson's xsl:fo. but its due to release in August..
so i shud be thankful if someone can give me some intro abt the requirements 
that calls for the use of xsl:fo.. any links that can help me   understand the 
subject
thanks


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