Erni:
And i recommend using Coding Badly's TinyISP. It gives you all the debug benefits you are used to from the Arduino
Serial comms? The problem with that is the Tiny85 has very limited pins. Dedicating some of them to debug output is difficult.
PS: This is why I do most of my Tiny85 coding on a Tiny84... they're similar enough that the code can run on both chips without much effort and the Tiny84 has enough pins left over to use for debugging.
( I use LEDs and a little screen for debug output...you can see my development environment here: http://arduino.cc/forum/index.php/topic,139345.0.html )