Question about Android Apps

I know, I know... You all are rolling your eyes about another question about Android apps in 2.0... But I actually searched for the answer before I created this post.

So I was using the Pimp My Music app (an Android app), and when I clicked "check for updates" it brought me to a webpage (in an Android browser) and it allowed me to view the android Market and even download apps. When I view an app it will show that "This app is compatible with RIM BlackBerry runtime for android apps" and when I click to download it says "this app will be downloaded shortly"

It's been a while, and I still don't see the app on my device... So my question is do I need "Runtime" to use the app? Where are the apps being downloaded to? I know your supposed to download android apps through app world but I'm wondering why they're allowing me access to download from the market...