Thank you for the questions.
1) As Gabe explained during the Sitefinity 4.0 RC webinar, pages and page groups in the Pages listing section of Sitefinity, as well as content items within the "News" , "Events" , "Videos", "Documents", "Forms" and the "Generic content" modules - those count towards the limit.
2) Items within custom modules, based on existing Sitefinity modules do count against the limit.
3) Controls are not content items as per 1) above, so the answer is - no, they will NOT count against the limit. If you have 5 news items in the backend and drop a newsview control onto a page, you will indeed be using 5 items and 1 page.
I hope that helps, Steve!
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