BuddyDev

Brajesh Singh

Disable Site Delete plugin only allows network administrators to delete a blog/site on a WordPress Multisite network. It does not allow blog owners to delete their blogs.
It works by doing that in 3 steps:-
<ul>
<li>Removes the delete Site link from tools menu for non network admins</li>
<li>Breaks out of wpmu_delete_blog function to avoid deletion of blog</li>
<li>hacks around option to avoid sending the delete confirmation mail to blog owner</li>
</ul>
Need more details, please visit this post on <a href="http://buddydev.com/wordpress-multisite/introducing-disable-site-delete-plugin-for-wordpress-multisite-based-networks/" title="Introducing Disable Site Delete plugin" rel="nofollow ugc">BuddyDev</a>

Disable Site Delete

a good simple plugin that does what ist says and does not try to do too much

Works as stated

Disable Site Delete plugin completely disables the site/blog deletion by a non network administrator

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.

Disable Site Delete vs Delete Custom Fields