We reported recently that RIM was giving away free premium apps in App World to US subscribers in attempts to bolster BlackBerry OS 7 smartphone sales in the US. As I was checking my email today it looks like RIM has stepped up the advertising campaign a bit with a mass email outlining the promo. Although this sucks for the rest of BB users around the world, it's nice to see RIM trying to step up their game among the US market where they have continually fallen in numbers. The total value in apps being given away is $77.00 and can be downloaded free until May 31st. BlackBerry OS 7 users only.