BSInspectors lets you inspect your objects in Xcode.
From the developer: Inspecting the objects that I deal with in my applications has been a dream of mine since I discovered this isn't working in Xcode. I finally decided to do that stuff myself and here it is: inspectors for your objects. The default version supplies an inspector for Arrays and Dictionaries and everything else is simply inspected by its debug string. The BSInspectors include a simple API for everyone to create his own plugins, so you can even inspect the objects you created just for your own projects. The archive includes the source-code and a sample-plugin.