Earlier this morning we posted a report covering Walker Digital's first patent infringement lawsuit against Apple concerning the iPhone's Map + Compass feature/app. On a second front, Walker Digital is suing Apple regarding their iTunes Store system. Apple is only one amongst 28 other defendants that offer online sales. The others include such brands as Amazon, Microsoft Wal-Mart, Verizon, Target and Saks. Less than a month ago Cordance Corporation sued Apple over their iTunes system as well. This is obviously going to take years before all of these iTune store system lawsuits get ironed out. As online app stores are about to explode onto the market in the coming years, these types of lawsuits will become commonplace as companies jockey for the right to royalties for their online sale patents. There's a lot of money at stake here for the winner(s) and the noise has only begun.