I bought catchen.me last year and point it to my old domain catchen.biz. Now I want to use catchen.me as my main entrance. That means I need to migrate all sub-domains under catchen.biz to catchen.me.
Why did I use catchen.biz at the first place? I wanted to register a domain from Google Apps in order to make sure that my domain is associated with Google Apps. Neither catchen.com nor catchen.net is available so I picked catchen.biz. However, I found out that people don't respond well to .biz domains. When I say "you can find me on catchen dot biz", they will ask "catchen dot what?" Then I understood that I needed to get a easily recognizable domain. That's why I bought catchen.me.
So far, I've migrated three sub-domains: english, cantonese, and dotnet. If the solution is stable, I will move chinese, which is the sub-domain with most content.