So here are my most used OS X applications of the year, in no particular order:
* Spotify. This is just an excellent music application, the speed with which the streams start is simply amazing and I don’t find that I get that many adverts in the way of the vast array of songs on offer.
* Textmate. I probably use this more than any other application on the Mac, for me hands down the best text editor that I have ever used and I find more and more features in it everyday.
* NetNewsWire Pro. Having all my RSS feeds in one place is really just what I need. Must remember to integrate it with FriendFeed.
* Adium. Always there, some times a pain with XMMP but otherwise just awesome.
* Python 2.5. Best scripting language by far, but then I am biased.
All free (I did buy a license for NetNewsWire but you no longer have to) apart from TextMate which is more than worth the price.