avrdude: Device signature = 0xffffffavrdude: Yikes! Invalid device signature. Double check connections and try again, or use -F to override this check.
As far as I can see you are you connecting pin 9 on Arduino to PB3 on attiny85, why is that.
Which version of the Arduino IDE are you using
using this ISPhttp://arduino.cc/forum/index.php/topic,108797.msg824488.html#msg824488 Reply #39
You could try this corehttp://code.google.com/p/arduino-tiny/http://www.ernstc.dk/arduino/attiny85.html
In my recent endeavours with ATtiny45 I experienced that error when the capacitor was not connected.I also noticed that it did not always achieve proper contact when put in the connectors on the Uno. so I moved it to the breadboard.