A few days ago I posted an I2C Master lib for the ATtiny85. You can get it (with an example) here . . .
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1236434254/255#255
Tonight I attached a 2x16 display (using an I2C GPIO) to the ATtiny85.
It's fun seeing what you can do with an 8 pin chip.