I have tried optimizing the CSS code for the following links, but I am still receiving an error message about optimized CSS delivery.
http://fonts.googleapis.com/css?family=Droid+Sans%7CUbuntu+Condensed&ver=3.6
http://www.sampleurl.com/wp-content/themes/radius/style.css
http://www.sampleurl.com/wp-content/plugins/contact-form-manager/css/xyz_cfm_shortcode_style.css
http://www.sampleurl.com/wp-content/plugins/wp-tooltip/js/tipTip.css
http://www.sampleurl.com/wp-content/plugins/wp-tooltip/wp-tooltip.css
http://www.sampleurl.com/wp-content/plugins/bft-pro/css/main.css
http://www.sampleurl.com/wp-includes/js/thickbox/thickbox.css
http://www.sampleurl.com/wp-content/plugins/weptile-image-slider-widget/css/weptile-image-slider-widget.css
http://www.sampleurl.com/wp-content/plugins/weptile-image-slider-widget/nivo-slider/nivo-slider.css
http://www.sampleurl.com/wp-content/plugins/wp-socializer/public/css/wp-socializer-buttons-css.css
http://www.sampleurl.com/wp-content/themes/radius/lib/css/960.css