According to randfish:
Yes, Matt Cutts said All Links to a Domain Help Every Page on that Domain Rank Better
Danny was complaining that Matt dodged the direct question three times in rapid succession at SMX Advanced, but that’s an answer in and of itself. If the answer was “not always” or “no, not really,” he’d be pretty happy to share that. Reading between the lines with what Matt (or other search engineers) say isn’t a fine art in this case – it’s stunningly obvious. The answer is “yes” – every (good) link to a domain helps all the content on that domain perform a little better.
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