GameTap has been offering brand-new, original titles at no extra cost for a while now (see: Sam & Max, Myst Online), but to take this trend and run with a third party is huge.
Closing out May Day is May 31st where GameTap will crack open its doors a bit with a new free-to-play portal. Not regulated to chump titles, the new service will launch with games such as Metal Slug, Bust-a-Move and Tomb Raider: Legend. This will be made possible with their new three-tiers of membership and a handy-dandy chart to explain these tiers (two of which are free, by the way) has been made available after the break.
In other GameTap news, both the press release and blog have mentioned the Metal Slug and King of Fighters series coming to the service. Nice.