To my mind Games of Chance is not one of the better products by GG, but then again it is free and it isn't all that bad either.
The product includes 3 games of chance, such as one might play in a tavern or gambling den. It includes a description of the games as well as how to use them in the Spelldancer RPG. Although the product mentions they can be converted to other RPGs, I think they are better situated within the Elizim setting, as each one tells you a little something about the culture that devised the game.
Whilst they are well thought out, I can't help thinking that for many RPGs, these “Games within games” are a little more time consuming and complex than is strictly necessary , but then I guess it depends upon your group and what they like.
Personally I would have liked to see them as an appendix to a larger product, perhaps in the Spelldancer RPG itself or in one of the promised Gazateers? Or even just on the GG website with some of the other free Spelldancer material that appears there.
With just 3 gambling games in the product I think there are other products on RPGnow that may be of more use to anyone wanting to fit some games of chance into their none GG games, but as a window into the Elizim background I find this quite interesting.
I'm quite torn as I sort of like it, and it is free, but can't see myself using it much and certainly not for games other than Spelldancer.