Winwood113: This seems like an old post, but I thought I'd add this anyway, even if just as an excuse to say hello.
In my case it was Heroes of Might and Magic. I own the German version on CD (two times even, I think). One day I got so fed up with the horrible German translation I went to look for a copy of the original.
I had used abandonware sites before and don't feel bad about it. And I found HoMM on one of those sites. But instead of the usual "download" button, there was a "Buy Now on GOG" (Good Old Games back then). I was curious and followed the link and suddenly I felt like a kid in a candy store. So many great classics, both I already had and which I always wanted to play - complete with installers that worked out of the box without hours of tinkering. And each one of them only a couple of dollars...
And here I am with 920 games in the account...