Partition size when install Debian

When I install debian, I always use partition portion like this :

Filesystem Size Used Avail Use% Mounted on
/dev/hda1 7.4G 239M 6.8G 4% /
tmpfs 503M 0 503M 0% /lib/init/rw
udev 10M 56K 10M 1% /dev
tmpfs 503M 0 503M 0% /dev/shm
/dev/hda8 11G 154M 9.5G 2% /cache0
/dev/hda9 11G 154M 9.5G 2% /cache1
/dev/hda7 14G 167M 13G 2% /home
/dev/hda2 3.7G 72M 3.5G 3% /tmp
/dev/hda5 14G 621M 13G 5% /usr
/dev/hda6 14G 414M 13G 4% /var

additional info :

* for swap, I use 2 x RAM if RAM =< 512.

note : this partition is just according to my opinion, and will different portion if other people set the partition.