The Hyperlink Helper bundle's Wrap Selection as Link will default to "http://some-site.com/" if it can't find something else to link to (e.g. something on the clipboard). Unfortunately, some-site.com is a real site which people probably don't want to link to by accident.
RFC 2606 http://www.rfc-editor.org/rfc/rfc2606.txt states that example.com can be used, and if someone does indeed go to example.com, they don't get surprised.
I'm sending this info because the "Send Feedback..." portion of TextMate brought up a page that suggested Bundle bugs to be discussed here. I don't know if the current behavior is considered by others to be a bug, but we had a near miss that almost caused some-site.com to be linked to in our production web pages. We'd definitely have preferred example.com to be in our pages had we not caught the mistake.