Is tree view available in Finder in Lion? I've seen on several forums that people use a tree view for their folders in Finder but I can't find anywhere how to switch to it.

Is the tree view available in OSX Lion?
The way items are shown in Finder can be configured through the folder's Toolbar, which gives four default options:

 


Icon View - Which is the regular layout of icons. 
List View - The items are shown in a list-like and can be navigated as a tree.





Columns View - Items are displayed through columns which show the file's path.





CoverFlow - Items are shown with the regular coverflow efect.


Note: While in a folder, you can switch through these options by doing Command + the option's number (1 is the icon's view, 2 is the list view, etc).