Many have questions if switching domain names will totally mess up their website rankings in the search engines. How quickly will Google index their new domain ? Can it provide a long term SEO benefit by switching to a domain with higher authority, or greater geo relevance using a Country code tld.
Aleyda Solis from Boda Click wrote a very good piece on SeoMoz to help answer some of those questions.
She provided a visual checklist.
Read the article on Seo Moz