I'm in the habit of linking to my own previous posts a great deal when I post. When I do this, WP sends a pingback to itself, and I get an email about the matter.
Sometimes my self-link will be the only link in a post, so I could untick the "pingback URLs" checkbox. But sometimes I refer to my previous posts _and_ I want to pingback other people in the same post.
I'd like to request that WP not pingback itself.
For those instances where there are multi-author blogs who _want_ to pingback entries from other authors on the same WP install, perhaps this should be a global option?