A lot of people don’t want the RSS Comments Feed and WordPress.org link in their Meta widget. Here’s the default display:
To modify what displays in the default Meta Widget in WordPress, you can use a plugin (which is probably the best option) or modify the source code.
Meta Widget Plugins
The following plugins are worth checking out:
Modifying the Source Code
If you’d prefer not to use a plugin, you can modify the default-widget source code by opening the default-widget.php (wp-includes directory in the root directory of your WordPress install) and look for the Meta section and highlight and delete the links you don’t want. Be sure to have a copy of the file in case you make a mistake and delete more than you should.