Years ago when I was just playing around with a homepage, I used a dynamic DNS service to point to my computer for my homepage. Google indexed it. When I got a real host and domain, I stupidly redirected that URL to my domain. The problem is, the dynamic DNS redirect has a PR of 4, and my homepage of 1, and it won't change because Google assosciates it with me. So, should I ask Google to remove the redirect URL? How will this affect the ranking/indexing of my homepage?
Email google and ask, post in Matt Cutts blog or send him a PM (he joined here the other day). Unless somebody has done this before its impossible to know how they will handle it.