After using iWebs Pagerank Predictor tool, I can immediately see flaws in it. I own several sites, and after using the tool it predicted a PR5-PR6 for nearly all my sites. This is highly unlikely, because I’ve owned sites for years with similar amounts of backlinks and i’ve only reached a PR5. Most of my sites are new, so I highly doubt I can jump from PR0 to PR6 immediately, unless I have several PR8+ backlinks.
Truthfully, I feel that pagerank is meaningless nowadays. Site pageranks have not been updated for months, and I still see several of my new sites with relatively high rankings (and no PR). I feel that the obsession with pageranks webmasters had in the past is why Google is delaying the pagerank update.