To see some names that might be worth something look at site like mine link in the email signature and there are other great sites like FreshDrops.net, Dnxpert.com etc where you can find reg fee names that are good.
I have never heard of such domain names. I assume that for the some specific spheres they are interesting ones, but I have no idea for which ones exactly
In general the domain industry has taken a downturn due to the economic situation. The only way any domain is valuable is with development these days unless it's a premium word dot com.