Pulse doesn't seem to take up a lot of space. I don't think the feeds accumulate. I think the old ones get dumped as new ones come in. Also, the feeds are primarily text, so they don't require a lot of space.
As for email, when you have mail in your inbox, all attachments are saved in your My Downloads folder, so these can take up some space depending on the size of the attachment. When you delete the mail, however, the attachments are removed from the My Downloads folder, even though the email is still in your trash folder.
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