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OK, it looks like the functionality to receive daily or weekly digests of new posts within subscribed forums exists in vBulletin version 3:

http://www.vbulletin.com/forum/showthread.php?t=75706
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As far as I can see, subscribing to a given thread results only in receiving an e-mail notification of responses within that thread; it doesn't contain the actual text of the response(s), which...

I'm a recent new member of this forum, and discovered that one is unable to receive copies of all postings in a given forum (like you would in a discussion list, or Yahoo! forums, etc.), but rather...