I checked expired domain names - www.olddomains.net There is some good stuff on it!
I was looking for some old health related domains, guess I'll get one from there.
These are two awesome sites to check dropped domains, with information such as, traffic, PR, age, back links, etc. Check them out and also list down your suggestions for checking out sites with expiring, dropped or deleted domains.
expired domain names - www.olddomains.net
FreshDrop.net - The Domain Searching Platform