Question about hard disk partition strategy for debian

[Lian Liming <lianliming@gmail.com>]

Hi all,
    I have 35 GB hard disk space for installing debian/ustable.I am a
common linux user and would like to do some web programming that means
I need X winodows with KDE and LAMP(linux, apache, mysql, php). To
limit damage upon system crash and better use the hard disk space, I
want to know something for the partition strategy.
   
    Which directories should I separate from the "/", should I
separate "/usr", "/var", "/tmp", "/home".... ? And then, how many GBs
should i give to these partitions?

   It is really welcome that someone can share their partition
strategy with brief explanation why they did so.

   Thanks for any suggestions.
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