Removing Widgets for all Blogs

Hi there,

I'm wondering if there is a plugin or a way to remove widgets from the Appearance ==> Widgets area. We're putting together a site that will have close to 800 blogs and users and I want to limit some items. For instance comments will be disabled on all sites yet there's a widget for Recent Comments. Our users won't need access to Archives, Tag Cloud, Meta, etc etc. Any suggestions on removing these would be welcome. Thanks,