I don't think I ever ate at The Winner's Circle, unless I was quite young. My father knew the family who ran the place, and I believe he ate lunch there from time to time. My understanding is that it was a "general" restaurant with Greek influences, and for many years was a USC area landmark (it was right across the street from the Law School).
At some point when I was living out of town, the place closed. I was disappointed because, like many places listed here, I had always figured that I had plenty of time to get around to trying it. I am unsure whether the current tenant, FEDEX/Kinkos, is using the old restaurant building, or whether they knocked everything down to build their operation. Unlike The Winner's Circle, I actually have gotten around to visiting the Kinko's. I'm not sure if this is still the case, but at one time they were open quite late, later than the other Kinko's in town, and they also had for-hire scanners, which I used several times before getting one of my own.
UPDATE 20 March 2010: Added full street address to post title.