I got a Nokia N73 from 3 mobile for free and have been using it for a year now. I'm still not sick of it, so that's good news!
Well, the good thing about N73 is it has a 2.1 megapixel camera which takes crystal clear pictures during the day or at bright area. Also, it has a sensor which automatically switches the light on the keyboard off when it's bright to save battery life. It also has a crystal clear display!
I also love the fact that you can read/open Adobe Reader on it, thus, you can do your work, and also Word application. There's also Sudoku on it, which I absolutely love!
There's also the media player as well as FM radio, and many many more features which I don't normally use.
The only downside to it is the camera's flash comes on when it's focusing regardless of the brightness of the area. I find that a bit annoying as the flash can be very bright!