Seemed like a kind of hastily thrown together list to me... I mean, it's kind of strange for a lot of apps that appeal to smaller groups of people to make the top 50 and none of the ringtone apps (particularly the amazing one from Jamendo) makes the list. I don't think any of the iFlickr type of apps were on the list either, of which there are several excellent ones.
I did see one or two I'd like to try, though. I don't have the app that lets you hide icons. That sounds like something that would be useful.
And of course a few I have, like fring.