The mega-feed of SLA RSS feeds is now powered by Yahoo! Pipes. (You can subscribe directly as well.) Grazr has changed its business practices, and no longer supports RSS feeds compiled from multiple feeds. The Grazr widget (listing feeds separated out by individual blogs) is still available but will not be updated.
Thanks to Nicole Engard for the refresher on Yahoo! Pipes and other mashups at SLA 2009. Her presentation is available here. (Scroll down to June 17, 2009.)