Aggregate all the .css and .js files from all plugins into combined files in order to speed up page load and minimize HTTP Requests from the browsers.
Extract the zip file and just drop the contents in the wp-content/plugins/ directory of your WordPress installation and then activate the Plugin from Plugins page.
You can use Yslow to test your blog's performance grade before and after adding the plugin. People are already reporting two-three grades improvements! http://developer.yahoo.com/yslow/