Help! Has anyone successfully programmed AVRs using the Teensy 2 as an ArduinoISP?

Hey all, trying to use a teensy to program bare avr chip (Attiny85 and attiny2313 mainly, I've downloaded the cores from MIT HLT and th arduino-tiny project) I simply cannot find any info about using the Teensy as an ISP however. Has anyone been able to accomplish this? Any suggestions?