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I also made a new version of the ATtiny45/85 support (and added ATtiny44/84 support) for Arduino 1.0: http://hlt.media.mit.edu/?p=1695
It uses the fact that the standard Arduino core is now more-or-less processor independent, so you only need to provide a single header file to add support for a new processor. The SoftwareSerial library (NewSoftSerial) works too.
Comments and improvements welcome: GitHub - damellis/attiny: ATtiny microcontroller support for the Arduino IDE