Great idea, but this won't last long, as the upcoming Safari 5.2 from Mountain Lion doesn't have any more RSS feature.
Possibly will continue to work in Mountain Lion / Safari 5.2, since it's an extension and may have RSS functionality self-contained.
Well, as far as I've seen, it doesn't. Just tested it on a sandboxed Mountain Lion workstation. It will install in Safari 5.2, but that's all. Since you cannot invoke the RSS sheet, you won't see any sign of the extension.
Do PubSubAgent and the pubsub command-line utility still exist on Mountain Lion? If not, I'll make a note to run "pubsub list" (on Lion) to get a listing of feeds before upgrading to ML so migration of them to another feed reader is easier. I'll definitely miss the convenience of having MacUpdate's main feed directly in Safari much more than the dozen or so others.
They are also removing RSS from Mail in ML :(
It's still possible, however doubtful, that RSS feed support will reappear in Safari and/or Mail on ML, which is one reason I asked if PubSubAgent and pubsub exist in the public beta.
This is very strange: The PubSub framework is still present in Mountain Lion and appears to continue fetching updates into the ~/Library/PubSub folder, but there is no more RSS frontend application available in Mountain Lion to view it.What gives? Am I missing something?
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