When you switch domains the history of the new domain is somewhat important and how you go about switching is pretty important too if you want to keep your google traffic.
They appear to have done it right, though: 301 redirecting the old domain to the corresponding URLs on the new domain, which is the SEO best practice that Google tells you to do.
(I know there is a Firefox extension that would let you check this but since I am intensely lazy I opened up a terminal and telneted to www.getdropbox.com on port 80 then typed "GET www.getdropbox.com/" enter, which produced the expected result, a 301 redirect header and some human readable text for idiots like me who test things by telnet.)
What I don't get is what they mean with 'dropbox.com blocked by Google', I can't find any proof of that and the diagnostics page shows some history information which indicates that there is not and has not been a problem.
Does anybody have a screenshot of what it looks like with the 'problem' visible ?
(I know there is a Firefox extension that would let you check this but since I am intensely lazy I opened up a terminal and telneted to www.getdropbox.com on port 80 then typed "GET www.getdropbox.com/" enter, which produced the expected result, a 301 redirect header and some human readable text for idiots like me who test things by telnet.)