Sedo.de is their .de website. On the first page of the most popular list they had the following at the time of this posting:
vote.de with 102 bids
wrestling.de with 70 bids
eshops.de with 68 bids
movies.de with 36 bids
notepad.de with 13
layouts.de with 36 bids
motocross.de with 1 bid
This is just a sampling of the many on their website. It is also of interest that almost every English word with .de as an extension is a German website.
So I think they are very popular but there are still some great keywords not used. For example, I recently regged:
cashadvance.de which gets approx. 1,000,000 searches a month from all search engines combined. What would cashadvance.com be worth?
Also regged:
oriole.de
warbler.de
meinkreditkarte.de (My credit card)
kreditklicken.de (credit click)
beerstein.de (What could me more German?)
carafe.de
asianflu.de
chickenflu.de
cupboards.de
fishingpole.de
prude.de
So far, these have generated very little in parking so I am going to develop mini sites for them and try to get search engine placement.
I also know that Network Solutions and GoDaddy will not transfer .de domain names. I am unsure how to transfer the domain names if they were sold. I think all of the sales listed are from German to German which is allowed by Denic.