One European source that accepts these name changes is Index Fungorum. Note that these changes were published in 2000 and were under debate for a couple of years after that. However, in the last few years it has been accepted by all sources I’ve seen. I’d be really interested to see any recent publications that explicitly rejects these changes.

Tom Volk has a good over view of the taxonomic reclassifications.
http://botit.botany.wisc.edu/toms_fungi/may2004.html
Also, check out the Coprinus page that Nathan linked to below.

In Europian literature there is no change of the genus name yet. All the fungi of the genera Copris, Coprinopsis, Cystolepiota and Leucocoprinus are still put in the genus Coprinus. The whole of the europian literature recognizes only the genus Coprinus. In Croatia is the same.

I was thinking about this exact case last night, but I didn’t have web access. A discussion of the motivation of this change along with links to additional info is available on the Coprinus page.