how to get more disk space? I try remove gnome.

[root0]

Hi, guys.
XO-1 only have 1g nandflash disk. so I want get more disk space with trying remove gnome.
open the terminal
# sudo yum remove gnome* (it's dangerous because some needs software will be remove too.that
will be reinstall again after remove gnome.like olpc-lib,olpc-utils)
I get some information about have 200mb free after running success.
but I check it with 'df -lh' commands. not any change, I don't know why?