Apple's VP of iAd (formerly Quattro's CEO) Andy Miller sent Apple employees a memo saying that the Quattro Wireless Network will be shut down at the end of September. Apple bought Quattro, which would lead to iAd, last year for $275. Silicon Alley Insider has a look at the memo . Meanwhile, RIM is shopping for an ad network, according to the Wall Street Journal . The publication cites the popular "people familiar with the matter". Here's a fun one.