Enable full-screen mode for applications on Lion There some applications which I can not yet run in full-screen mode. I particularly would need the OSX Terminal app and possible the TextEdit. However, after the upgrade they remained the same, and does not have the full screen button in the top right corner. How can I enable Lion style full-screen mode for there applications?
Lion's Terminal.app does support fullscreen mode. Maybe you are overlooking it? How did you upgrade?

As for TextEdit, applications need to explicitely implement Lion fullscreen support, and this has not been done for TextEdit. There are other 3rd party text editors that have implemented fullscreen mode, depending on what usage you have for a text-editor.