For those struggling with the install, it may be easier/better to unzip the file in one's themes path ...
cd wp-content/themes wget http://downloads.wordpress.org/plugin/wordpress-mobile-edition.2.0.zip unzip wordpress-mobile-edition.2.0
Moving the plug-in into the plug-ins path
mv wordpress-mobile-edition/wp-mobile.php ../plugins/wp-mobile.php
Then move some things about, such as, from the THEMES path:
mv wordpress-mobile-edition/wp-mobile/ wp-mobile
And then clean up a bit
rm wordpress-mobile-edition.2.0 rm -rf wordpress-mobile-edition
Careful with that last rm command - it can be rather destructive.