By default WordPress send you pingback notifications to admin email which you have assigned in your WordPress site. This sometimes becomes irritating specially when your weblog start getting popular and you get hundreds of pingback notifications. This tutorial explains how you can set a custom email address for receiving pingback notifications and avoid populating you main email address.
There are many plugins that allows you to show your blog comments in various styles. Some allows you to display comments with avatars, some displays top commenters, featured comments etc etc. But there are very few plugins or might be this is the second one that allows you show your WordPress site’s Trackbacks and Pingbacks as sidebar widget.