An interesting video I watched a few days back pointed out some flaws in passing variables via the URL. Obviously this isn't something that can be avoided very often, but using mod_rewrite fixes the problem. What his tests showed was that static pages(or pages that appeared static) that branched directly off from the main page(highest PR) tended to have a PR value 1 less than the main page. Of course there can be variations to this. While this was true for static pages, pages that used the "=" or the "&" or the "?" in the URL tended to see less PR gain. Now I don't know exactly how true that is, but it seems to be pretty typical, and using mod_rewrite, from what I've seen, isn't really that difficult.
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