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However, all of the pages that are linked from my homepage are also PR6.
I think it's a typo. I think zorafex was trying to say that they have a flat six.
It's possible that you are near a PR 7. It's also possible that you have some deep links working hard.
One way to check is to compare how the Google directory lists you within the category. Check the PR of the site above you.
Don't expect miracles from PR, though. Nowadays it's quite common for a PR 0 website to rank well above others with higher PR. It's been this way for awhile.
I went to the google directory and I'm 11 a way from PR7 in that sense. There are 127 sites within the category.
A PR7 page will be a milestone for me. I believe that's the highest I will ever get, and I believe it will be an accomplishment when I reach that goal. There is only one other site in the world that has a PR8 in my niche. There is only about 5 in the world with PR7 :) I hope to be the 6th the next google update.
Wish me luck