SalesForce Customer Support Portal & SalesForce Migrations

1.) Has anyone had any experience working on/developing a SalesForce
customer portal? If so, what are your thoughts?

2.) Performed a migration to SalesForce.

Many thanks in advance.

--
Mario Bourque
Web: www.mariobourque.com
Email: mario at mariobourque.com
Twitter: www.twitter.com/mariobourque