Re: MSN Rank
Yes changing your domain name does make you start over - the right thing to do is 301 redirect the old domain name, but this does not mean that you will automatically get your old rankings back. You need to build new links and deal with the sandbox all over again.
My best guess as of today for a new domain
MSN 1-3 months
Yahoo 6-9 months
Google 9-12 months
(For first page rankings if you do a good job with your SEO and have the resources to build decent links)
Starting LEC 7 soon but it won't be called LEC 7 - LEC 2012 coming soon!