TechCrunch Disrupt winner Qwiki launched its iPad app in the App Store a less than a week ago and after 11 days has hit the quarter of a million downloads milestone. This is notable for an iPad app, especially when compared to other highly publicized iOS app milestones; It took iPhone app Instagram six days to hit 100K, SoundTracking two weeks to hit 250K and FourSquare a whopping seven months to get to 60K users. Qwiki PR rep CeCe Cheng tells me that Qwiki.com has "millions of users" but that the Qwiki app, which lets users see notable Qwikis around them in map format, has already eclipsed pageview traffic on the Qwiki site by 5x. By the end of the day tomorrow it's estimated that the app will hit 300K users after only two weeks. Individual user sessions are now averaging 24 minutes.