This list is good however people should still do their due diligence and read the official gambling thread here on Bitcointalk to be up to date with the latest issues, you can't read all the pages but you should read at least the first post and the last couple of pages.

Safedice does have a red flag, but the red flag was added recently and it actually was having withdraw issues for an entire year (or longer even).

There are also many numerious sites not listed which are all red flagged and are proven scams. And the easiest way is to simply read the thread. Because usually the red trust is added way too late before more people get ripped off in the meantime.