I recently got a Macbook Pro which is running OSX 10.6 and is the first MAC I have used as my primary computer. Setting it up has been like setting up the first computer I ever setup since I am used to setting up computers running Windows or Linux. Anyhow it has been a great learning experience so look out for a lot more articles related to OSX and Macbooks in the near future. Anyhow the below steps will assist you changing the default application that opens text files from TextEdit or TextEdit.app to TextMate or TextMate.app.
On Windows I use Notepad++ religiously however since Notepad++ is not available for OSX I am trying to become familiar with TextMate. So far TextMate is pretty solid but there are a couple things that make it less convenient to use. One of the primary items I noticed almost immediately was the fact that TextMate does not support tabs in the same way that Notepad++ does. The good news is there is a work around where you can use tabs in a very similar manner. Use the information below to work with tabs in TextMate which if you are like me you require easy access to numerous text documents at the click of a button.