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I have recently implemented RSS for some forums, which before had been PR0 (the rest of the site they inhabit rank 3-4) Within a couple of days of posting the RSS link on the footer across the whole site, the PR for the pages referenced by the RSS feed suddenly jumped up a notch or two (1-2 from 0).
YMMV - could be fluke of course, but just looks like too much of a co-incidence to me :)
Which would lead me to suggest that implementing RSS for your site, makes Google consider your site more authoritive?
Anybody else tried anything similar?