Comment by rudd

It seems like a number of apps will probably do this. For instance, I can't find Twitter for Mac outside of the app store, which is disappointing because I'm still on Leopard, stuck with Tweetie 1.2.8. I would say to be wary of losing your Leopard user-base, but being on the Mac App Store probably will give you enough exposure that you'll make up for it and more.