Advertising/subscription feeds?

["wkearney99" <wkearney99@hotmail.com>]

Given the recent news of Salon isolating some content to subscriptions,
MetaFilter taking ads and now SlashDot dangling the possibility of
pay-to-exclude functionality (also available in Yahoo Groups).

What does this bode of syndicated feeds?  How long before the
schlockmeisters start tacking advertising into feeds?

How prepared are the various client and aggregators for possible login
requirements of subscribed feeds?

This leads to the question about how to handle forwarding or routing of
content derived from subscribed feeds.

Thoughts?

-Bill Kearney