GOG.com, an online game store that sells vintage titles, has debuted (via TUAW) a new indie game portal to sell indie games to Mac and Windows users, much like the Mac App Store or Steam. The new portal will not only use the GOG.com staples like DRM-free games and "one world - one price" thinking but also offer additional incentives to developers to entice them to release their games on the new publishing platform. While developers will be able to use traditional revenue splits like the 70/30 developer/publisher that Apple offers for the Mac App Store, they will also be able to opt to receive their royalties in advance. In that situ
