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I see the following kind of thing a lot, talking about authentication with RSS feeds:

[...]  Right now, RSS is all anonymous and doesn't care who you are.  Does ATOM/ECHO/PIE have it in its specs for any sort of authentication, so a person could get customized content?  Maybe an employee vs. a customer could get different content instead of having two different places a person would have to blog from.  What about security?  Sensative data...SSL? [Erik Porter]

What many folks seem to overlook is you can do all of this today. You can use HTTP authentication mechanisms, and many aggregators (including, of course, NewsGator) will support it. It's being done every day, both on the internet and on corporate intranets. And SSL is also supported, if you need an encrypted connection.