"Folder Information Dialog" in TextMate projects

To exclude certain files in a referenced folder in a TextMate project open the "Folder Information" for that folder by pressing the "info" button in the lower right of the project drawer or by pressing ⌘i. Then you can exclude files or folders using regular expressions. You could e.g. exclude all .o files and .class files by adding the following to the "File Pattern" input field: !\.(o|class)