Can CSS aggregation be enabled?

This site takes forever to load because of all the css files:

@import "/profiles/basic/modules/date/date.css";
@import "/modules/book/book.css";
@import "/modules/forum/forum.css";
@import "/modules/node/node.css";
@import "/modules/system/defaults.css";
@import "/modules/system/system.css";
@import "/modules/user/user.css";
@import "/profiles/basic/modules/cck/content.css";
@import "/profiles/basic/modules/cck/fieldgroup.css";
@import "/profiles/basic/modules/img_assist/img_assist.css";
@import "/sites/barcelona2007.drupalcon.org/modules/jstools/jscalendar/jscalendar.css";
@import "/sites/barcelona2007.drupalcon.org/modules/jstools/jscalendar/lib/skins/aqua/theme.css";
@import "/sites/barcelona2007.drupalcon.org/themes/garland/minnelli/style.css";

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