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.

Josh Hartman

Command your admin dashboard. Manage built-in widgets (Right Now, Recent Comments, etc.) and dynamically registered widgets (Google Analytics Summary, WP E-Commerce Dashboard, etc.). Hide widgets depending upon user capabilities.
This plugin is based upon Dave Kinkead’s Dashboard Heaven plugin and extends it to support dynamically registered widgets, such as dashboard widgets that are added by a plugin.
After installation access to all dashboard widgets is removed, then you can use the options at Settings > Dashboard Commander to configure the minimum access level for each widget.
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Dashboard Commander

Command your admin dashboard. Manage built-in widgets and dynamically registered widgets. Hide widgets depending upon user capabilities.

Delete Custom Fields vs Dashboard Commander