Jeff Murchison has released a new version of my TinyLoadr Shield, which was used for programming ATmegas and ATtinys using your Arduino.
The new version is just a USBtinyISP-based programmer with a ZIF socket for DIP microcontrollers and 10 and 6-pin ICSP headers for programming target boards.
More information can be found at MurchLabs.
Via the contact form.