Well, you can put together a podcast by huffduffing what others have already huffduffed (about half of the stuff I'm huffduffing is stuff that other people have already huffduffed). If you're logged on and you view something that somebody else has already huffduffed, you'll see a "huffduff it" button next to the title.
But I take your point that you'd like to be able to mark *some* of other people's huffduffed stuff and subscribe to just that. I guess you could subscribe to people's tags ("I like everything by X that's tagged with Y") but that isn't very precise (especially if people aren't tagging everything they're huffduffing).
If there's more demand for something like this, I'll seeing about adding it but for now, I'm going to leave it as is.
Thanks for sharing the idea, though. Keep 'em coming.