OmniGraffle is one of my favourite programs, mainly because it can generate professional looking graphics very easily. However, one thing has been annyoing me for quite some time: pressing the tab button when you are in a text box moves the cursor to another object rather than indenting the text inside of the object. After searching around a little, I found a blog post explaining that you need to use cmd-tab to get the expected tabulator functionality. Not the most logical thing, but at least I am happy to be able to indent text also in OmniGraffle.