Is it easier to get a high PR in certain categories ? Maybe older more web categories like webmastering and programming ? This seems to be the case to me, but I am wondering everyone's opinions...

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No... there is no connection between PR and cathegories, market, keyphrases... it's just about links to your pages...

I think it is dependant on the key phrase...though that's my opinion based on data that I've seen.

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From the studing of Pr that I've done and my experience on my site, I'd have to say the following:

1. PR seems to follow a sliding scale when it comes to links and keywords.

example: my cleaning site is a PR5 with 43 google backlinks showing and only a couple of pr5 page linking to it.
Now to accomplish the same thing in a harder keyword like home mortgage, the sites I've followed had to have closer to 300 backlinks showing in google, with many of them being much higher pr than the number to be obtained.

I feel google must somehow average out the # of links to sites covering certian phrases and applies the pr now on the 100% scale. If you have more of a links score than 50% of those in the index than you must be a pr5, 70% a pr7, or the lowest ten percent in the link score and you get a pr1. This is the only way it all seems to make sense.

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I've pi$$ed around a little pr amoung sites in different categories and it makes no difference at all. I'm willing to bet that if you looked at the quality of the links on the different sites it would be more apparent. (not just the pr of the pages linking but the number of total links on the pages too)

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