Are you tired of downloading,unziping,uploading,testing...the ZIP file just for a wordpress theme? Yes! You need a easy installing themes' plugin.It named Get_Theme!
Now,you only need a theme URL like
http://wordpress.org/extend/themes/download/dum-dum.1.3.zipand one click, you can install a theme easily and quickly!
When you installed the plugin,go to WP-admin -> Settings -> Get_Theme, put your theme URL on the form , then click Download Theme. While downloaded and unziped , go to Design menu and activate the theme.




