Not much, I don't think, but I only know Germany, and not very much of it.
There is an emigration museum just opened in Bremerhaven last year. It mostly covers overseas emigration, but also some who went elsewhere. Their records currently cover the periods 1820-1833, 1840-1891, 1904 and 1907. You can actually order a search to be done online, for a fee (rather hefty).
http://www.deutsche-auswanderer-datenbank.de/index.php?id=51 I have just learned that 3 (possibly 4) of my relatives are listed there. They all went to England, never to America. For me, it is a very valuable resource; perhaps it would be of value to you as well.
Various archives in Germany have various records. With the help of another rootschatter, I found a relative on the Auslanderer (emigration) records of the Lower Saxony Archives (Niedersachsen) online, which led remarkably quickly to my discovering my living German family! See Rena's post on the previous page of this thread. The Auslander record, from 1867, said he was going to America, but he did not get there; he only went to England. The archivist at Niedersachsen archives most emphatically would not send me the record, saying "it is not possible", and she tried to discourage me from thinking I might have found the right person, but, still, in spite of her, the info online was sufficient to get me started in the right direction, and I was right all along, as it happens. So, don't be discouraged by German archivists is my message!