SlingPlayer Mobile for iPhone is set to make its debut this week during MacWorld 2009. If you own a Slingbox and an iPhone, then you’ve been waiting for this moment for quite some time. Sling Media will be showing off the current build of their SlingPlayer Mobile iPhone app, which they plan on submitting to Apple for App Store approval by the end of the first quarter of the year. This is gonna be one to watch. We’ll try to get more screenshots, or even video of the app, from Sling in the meantime.