Use a third-party CSS or JS Framework, a self-hosted service like a CRM, or a third-party service with the site.
cURL module provides hook_requirements() implementation to show if cURL library is installed on status report page.
Subscribers Counter displays a number of site's feed subscribers in a block with link to main feed.
Decounter is a small module which decreases content view counter each time a user matching criteria is viewing a node.
OBSOLETE: According to the community you should use the http://drupal.org/project/diggbar_blocker or
This module removes the DiggBar that Digg.com adds to outgoing links and changes the shortened URL to the actual URL. It can also optionally redirect to a specific page.