I have one tool that can predict the PR of your website, might me useful to all of you. here is the tool:- iwebtool.com/pagerank_prediction
LOLz .. sorry it made me laugh .. well if the trend goes the same way, we shall see plenty of jobs for "SEO Palmists" in near future. BTW: What's zodiac of your website?
The PR prediction tool at iwebtool(dot)com is a big joke and most of the time, the results are inconsistent. Only one can predict the PR correctly and guess who? It is none but Google...
Who needs a prediction when it is going to be updating next Wednesday? What your PR is on Wednesday will be FACT.
I haven't even clicked on the link to check it out. Not going to waste my time because: 1) As others have said, NO ONE can 'predict' PR. Any attempts to do so are totally just pulling numbers out of your @$$... and 2) PR is overrated. It weighs very little in the overall ranking algorithm. Too many people worry about PR when what they should be worrying about is getting relevant pages to link to you using the keyword phrases you want to rank for in the link text of the inbound links.