A few days ago I stumbled across an actual on-page PR8 blog, and I left a comment relevant to the topic with my backlink. Turns out it was "nofollow" and didn't think too much of it.
I checked my Google rankings today for one of my sites, and I'm now sitting at the number #1 spot! (Before I was ranked #6)
I haven't done much backlinking lately, and I'm starting to think the PR8 link caused it. Is it possible that this backlink gave me this boost in Google? Or is it more likely coincidence?