Moved to "Search Engine Optimization Forum" as this post is more relevant there.
As for your
PR moving from one domain to another. Don't worry if your
PR number will be the same on the new website as it was on the old.
What you would like to happen is to have your old backlinks that were matched to the previous domain move over to the new one. The answer to this question is ALWAYS different for every website. Most of the time if a proper 301 redirect is put in place 3-4 months later Google will update the backlinks. Yahoo usually takes a bit longer depending on when they picked up your change and their algo update cycle.
I assume your doing the redirect because you want to focus and perform better on the Australian search engines?
OK now I went in and checked the header on
http://www.businesstrader.biz/. It seems to be doing a 302, not a 301 redirect. Is this something you wan to do? If so it is OK. I have heard some report good (faster) results doing a 302 redirect for a week or two and then switching to a 301 redirect. Is this your plan?
As always the best way to make this change go quicker to to contact the websites linking to you and have them change their links to you.