If you want to pitch a game for the Xbox 360 Live Arcade, you better get in line.

Next-gen.biz reports that Microsoft says it's being overwhelmed by new game pitches for Xbox Live Arcade. When Microsoft requested applications for Xbox Live Arcade game proposals, they had no idea of the tidal wave of interest they'd receive.

At the Develop Conference today in Brighton, England, Microsoft's Jeff Sullivan said, "We're saturated."

According to stats from the conference, 65 percent of Xbox Live users have downloaded an Xbox Live Arcade game, with downloads now at 5 million. The conversion rate is around 20 percent (from trying a demo to actually making a purchase). And that's impressive, compared with less than 2 percent conversion in the PC market.
   
The top games are now Geometry Wars, Uno, Marble Blast Ultra, Gauntlet and Zuma.

Sullivan offered some hints for those folks hoping to get their games onto Xbox Live Arcade. He said to try for: 

• Gameplay that is immediately obvious to the player.
• Multiplayer options that include co-op play.
  
• A worldwide appeal - not just North America.
• Appealing graphics.
• Downloadable content options.
• Tie-ins with orther products or games.