Problems with yaourt

Question

I've been working at this for the last couple of days, trying to install various games on my new arch install that is. I've been primarily using yaourt to do this, but I am having alot of problems. This is one of the errors I'm getting when attempting to install savage2.
Cannot write to “Savage2Install-2.1.0.1-x86_64.bin.part” (No space left on device).
==> ERROR: Failure while downloading Savage2Install-2.1.0.1-x86_64.bin
    Aborting...
==> ERROR: Makepkg was unable to build savage2.
==> Restart building savage2 ? [y/N]
==> --------------------------------
==>
sort: write failed: standard output: No space left on device
sort: write error
comm: write error: No space left on device
==> WARNING: Following packages have not been installed:
    savage2
I was also getting a different version of the error, something like "A failure has occured in build() aborting"
The install is on an 320 gig hard-drive, and I recently re-installed arch, so it shouldn't be full.
Here's the output for du -hs /*
5.4M    /bin
28M    /boot
112K    /dev
5.4M    /etc
5.9G    /home
120M    /lib
4.0K    /lib64
16K    /lost+found
16K    /media
4.0K    /mnt
270M    /opt
du: cannot access `/proc/13361/task/13361/fd/3': No such file or directory
du: cannot access `/proc/13361/task/13361/fdinfo/3': No such file or directory
du: cannot access `/proc/13361/fd/3': No such file or directory
du: cannot access `/proc/13361/fdinfo/3': No such file or directory
0    /proc
28K    /root
224K    /run
13M    /sbin
12K    /srv
0    /sys
2.3G    /tmp
3.1G    /usr
1.4G    /var
Note: Some variation of the first error happens almost every time I attempt to install a file using yaourt.

Answer 1

Filesystem                                              Size  Used Avail Use% Mounted on
udev                                                     10M     0   10M   0% /dev
run                                                      10M  212K  9.8M   3% /run
/dev/disk/by-uuid/f6d80eb1-5f12-4230-b72c-642c0b778f7f  7.3G  4.2G  2.7G  61% /
shm                                                     3.0G  200K  3.0G   1% /dev/shm
/dev/sdb4                                               286G   17G  255G   7% /home
/dev/sdb1                                                99M   30M   65M  32% /boot
/dev/sdg1                                               932G  612G  321G  66% /media/poop