Magnathorax

One Click Delete Page and Post is a lightweight, secure plugin that places a convenient “Delete” action in the frontend admin bar for users who have the <code>delete_post</code> capability. By default a confirmation dialog is shown; the plugin moves the current page or post to Trash when confirmed.
A settings page (Settings → One Click Delete Page and Post) provides a single toggle to enable or disable the confirmation dialog.

One Click Delete Page and Post

Adds a "Delete" item to the frontend admin bar next to the Edit link.

Sam Margulies

Ever have one erroneously entered custom field name confuse all of your users and you just can’t figure out how to get rid of it? Delete Custom Fields will let you delete every instance of a custom field from your site. Once your remove a custom field using this plugin it will not appear in your list of custom fields when you edit a post or page.

Delete Custom Fields

Doesn't show all custom fields, though (even if you choose Show Hidden) - would be nice to have them as a list instead of a dropdown, but otherwise it does what it promises.

Works

Remove every instance of a custom field from your site.

One Click Delete Page and Post vs Delete Custom Fields