Since there is currently a lack of documentation for each type, it may be hard to find out what kind of stuff you can actually do with certain types. For example, if you want to know to what properties you could bind when binding a Label, you really have to take a quick look at the source and find it out yourself.
I've put together a little Atlas Class Browser which lets you quickly find a type and display its member information. Hopefully this makes it a bit easier to understand the capabilities of the current types in Atlas.
Update: I have updated the class browser with support for viewing the source code as well. The formatting may be far from perfect, but I thought it would be better than nothing.