So there we have it, two major forces on the web working to make sure what we say in private isn't subject to prying eyes. The thing to remember is that the actual meat of your messages is secure, but the metadata -- who it's coming from, who it's being sent to, what's in the subject line -- is still fair game. Yahoo's plan involves modifying the End-to-End web plugin that Google introduced earlier this summer, but this whole shebang hinges on making the process of swapping secure messages easy. We'll have to see just how elegant Yahoo's solution winds up being; the prolonged privacy of millions of users may soon depend on it.