New to the PlayStation Store this week is a ton of downloadable content including Rock Band, Guitar Hero III: Legends of Rock and Army of Two DLC, three new demos, and a fresh addition to the PSOne Classics library. In terms of the week's downloadable content roundup, the Variety Map Pack for Infinity Ward's Call of Duty 4 is up for grabs. Priced at $9.99, the Variety Map Pack includes four multiplayer maps: Creek, Broadcast, Killhouse, and Chinatown (a remake of the classic CoD map Carentan).

New content for Neversoft's Guitar Hero III: Legends of Rock this week is the Def Leppard track pack, priced at $6.25. In addition to the band's new single "Nine Lives," the pack also includes master tracks of "Rock of Ages" and "Photograph."

Fans of Harmonix's Rock Band, meanwhile, now have access to the game's first full DLC album, Judas Priest's 1982 opus "Screaming for Vengeance." The pack is priced at $14.99 for the whole ten-track album, or $1.99 for individual songs. Check out the full list for more details.

A new expansion set for SCE Japan Studio's card-battler hybrid Eye of Judgment is now live, entitled Biolith Rebellion 2. The set adds 100 new creatures, spells and abilities, and is priced at $14.99. The cards for the new expansion are sold separately and should be available on retail shelves now.

Players of EA Montreal's fistbumpin' mercenary shooter Army of Two can download the SSC Challenge Map Pack for $7.49, which includes four new co-op maps for two players.

Playable demos of Secret Level's Iron Man and SCE Studio Japan's echochrome (PSP, PS3) are available for download free of charge. The echochrome demo is available for both platforms the PlayStation Store on the PS3, while the PlayStation Store for PC will offer the PSP demo only.

And finally, Irem's R-Types (PSX) has been added to the PlayStation Store's PSOne Classics lineup, priced at $5.99. Uniting the supremely difficult R-Type and R-Type II in a single package, the compilation represents fond memories for shoot-'em-up nerds like yours truly.