I've got another fix for the duplicate item problem posted. The problem: after loading it, you'll see a large number of dupes (I changed the way the GUID is fixed in the absence of one in the feed). After that, it should be better. If you open up the "Execute Smalltalk Code" workspace and execute this after the update, the change won't generate as many duplicates:

RSS.RSSFeedManager default getAllItems do: [:each |
	(each link notNil and: ['*feedburn*' match: each link])
		ifTrue: [each guid: each link]]

Just highlight that code, pop the context menu, and pick "do it"