Konami released a little more detail on the four original Playstation Portable games they will be releasing soon after the PSP hits North America. Two are set for a Spring release and two are supposed to hit this Summer. Here's the skinny:

Metal Gear Acid
Ship Date: Spring 2005
Wireless Multiplayer: Up to two players
A brand new Metal Gear story blasts its way on to the PSP handheld system with a new gameplay system that focuses on deep tactical strategy. As the role of top-secret agent, Solid Snake, players will make calculated decisions to plan out their infiltration strategy and accomplish the mission in a turn-based style of game. Through the use of strategic battle cards, players are given different abilities and stealth tactics to achieve the mission objectives.

Rengoku: The Tower of Purgatory
Ship Date: Spring 2005
Wireless Multiplayer: Up to four players
Rengoku: The Tower of Purgatory is a stunning third-person sci-fi/action game that places players in a dark and distant future. Rengoku puts gamers in the role of a well-armed battle android that must fight its way to the pinnacle of a great tower to confront a mysterious foe. As players battle upward, they improve their android's skills, acquire new weapons and technologies.

Coded Arms
Ship Date: Summer 2005
Wireless Multiplayer: Up to four players
One of the most highly anticipated titles for the PSP handheld system, Coded Arms is a visually stunning first-person shooter that places the gamer in the role of a computer hacker who infiltrates an abandoned and severely flawed virtual reality system. Arming themselves with an assortment of weaponry, gamers battle deadly aliens, computer bugs and the VR system's own security bots through the virtual landscape, delving deeper into the heart of the unchecked system.

Death, Jr.
Ship Date: Summer 2005
Single Player
Death Jr. is a new action platforming game that serves up a large dose of intense gameplay and weapon heavy combat. The game stars Death, Jr. (DJ), the teenage son of the Grim Reaper, who is armed with a mighty scythe, which serves as both a weapon and a unique platforming tool, along with an arsenal of guns and explosives. Using all of the tools at his disposal, DJ must save his friends and the world to keep from getting into serious trouble with his Dad.