SCEA is launching some new game demos and trailers today at the Playstation Store. A total of six new, free downloads will become available today. Here's the list:

Ninja Gaiden Sigma Demo: Play as Master Ninja, Ryu Hayabusa and infiltrate your way into the Vigoor Empire destroying evil ninjas and demons as you attempt to overthrow the Empire, exact revenge on your enemies, and reclaim the Dark Dragon Blade.

Virtua Tennis Demo: The fun, addicting, award-winning series continues with Virtua Tennis 3. With ultra-realistic graphics and precise player control, gamers will hit the court and play as or against today’s tennis elite including Federer, Sharapova, Roddick, Nadal, and Williams.

Gauntlet II Video: Check out this video for Gauntlet II, where you can re-experience the classic dungeon crawler and play as the Warrior, Valkyrie, Elf, or Wizard!

The Wheelman Trailer: Vin Diesel is The Wheelman, who must prove himself to the Barcelona underworld using his incredible driving skill.

Stranglehold Trailer: Continue the story of John Woo’s influential action film, Hard Boiled, engaging your enemies in intense cinematic gun battles.

The Godfather Trailer: Experience the excitement of the legendary films and work toward becoming a Don in America’s most powerful criminal organization—the Corleone Family.

Also available for download is the latest firmware update, Firmware Version 1.70. The update adds the ability to download Playstation format software and play it on the Playstation 3. Some games will also be playable on the PSP. In addition, some accessories that were meant to be used with the Playstation 2 format software will now have force feedback enabled. Obviously, only accessories that have the force feedback functionality in the first place will be able to do it. Finally, the new version also allows for the use of save data from Playstation format software on PSP. If you're interested in finding out how that works, click the link here.