cabbie - 10:40 am on Oct 6, 2009 (gmt 0) [edited by: tedster at 5:55 pm (utc) on Oct. 6, 2009]
HI Nick, I have just done this with a site that was the authority for its area.
I followed advice given by Google [google.com]
I also reported and verified both sites in webmasters tools account.
Its early days yet (2 weeks) but I am disappointed with the results thus far.
The new site is ranking for long tail keywords but I have lost all main kw serps with both sites not showing where as it had indented positions before.
I really thought google would have handled it better and quicker.
I am still hopeful thoughbut if no improvement in 2 weeks, I will put the old site back,which might be interesting in itself.
[edited by: tedster at 5:55 pm (utc) on Oct. 6, 2009]