Gameolith's launch titles include SpaceChem, Big Fat Alien BEEP, BOH, Grappling Hook, Hacker Evolution Duality, and Family Farm. Ever hear of any of these titles? Neither have I.
All of these games also happen to be available via Steam and/or Desura. Additionally, none of the titles are too graphically or technologically advanced where the Windows versions would likely work just fine under Wine (but they have native Linux clients available, one of the games is even available for AmigaOS). From the respective game web-sites, there's also Linux demos available for many of them.
It would appear the only thing that Gameolith has going for it at the moment is that it hasn't yet had a server incident that's spanned multiple months, like the TuxGames Linux online store did when Linux Game Publishing had their single-server out for more than two months. We'll see how it goes in just over 26 hours when a UK web-design firm officially launches this online Linux game store.
Assuming that Gameolith doesn't magically pick-up the exclusive rights to some premiere titles or some very innovative features, you're best off just waiting for the Linux client releases of Desura and Steam. (Not only is the software better and a much greater selection of titles, the food also happens to be interesting near Bellevue as are their skies.)