RE: Maybe you don't really need an app for that...
I couldn't agree more with your post.
Another app where I prefer to use the web version is Facebook. The web version runs great on the Playbook, and all of the features run smooth.
One of the most frequent criticisms of the BB ecosystem in general is the lack of apps. However, I really think that the (almost)full web experience on the Playbook really makes many apps redundant or unnecessary.
I would really like to see Java support and an improved bookmark management system, but other than that the browser is top-notch.