Pluginception

Install, activate, and then go to Plugins->Create New Plugin menu to create and activate new blank plugin, live, on your site..
After the plugin is created, you'll be taken to Plugin Editor screen, to type or paste in your new plugin's code...
Pluginception also uses WP Filesystem methods to create the plugin, so there's no worries about incorrect file ownership on shared hosting.
You may have to give it FTP credentials on some hosts for it to be able to create the plugin, that's WP Filesystem at work, making sure the files are correctly owned...
All this plugin does is make it quick and easy to create new one-off plugin and take you directly to editing it.
Having to then encapsulate it into plugin, fire up Filezilla, navigate, upload the plugin.
This gives me easy way to create new blank plugin and go to the editor to paste in the known working code..
If you paste in non-working code, or decide to use the editor to experiment, then you'll break your site.
I needed to modify Restrict Content Pro plugin membership form, and was advised to add the modified code to plugin using Pluginception..
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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