While it is a nice idea, I do not see any practical applications.

It requires a receiver who is a) knowledgeable enough to decrypt it using something like openssl and b) have access to the actual private key.

If that's the case it is highly likely that this person is either capable of using something like PGP or facilitate a file upload form on the apparently available website. Both of which are at least as secure and a whole lot more convenient.

Something related to this I would be really interested in would be a way to encrypt a file client-side, in the browser using javascript prior to uploading it (without the need for the user to do special tricks beyond picking a password). So far this only seems remotely possible using something like flash or silverlight.