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Yahoo now have integrated RSS support into their beta mail offering which you can find directly below your email folders.  All RSS feeds are stored in a separate folder so that you can view items in the order they were received. 
Feeds items can be treated in just the same way as emails meaning that you can forward and file items as you wish.  The beta also has lots of AJAX functionality allowing you to drag and drop items as you wish.

Technorati Tags: Yahoo!, RSS, AJAX