bperrybap beat me to it. (I had to teach though 
)
I would give westfw's work two thumbs up. I've had trouble bootloading one particular chip and it bricked. I was only able to unbrick it by loading it with westfw's updated optiboot bootloader. I have not tried the optiloader, which should be another highly regarded tool to mass-brainwash chips with older bootloaders or load a brain to blank chips. I ordered 25 blank chips and will have a go with optiloader later this week. I'm a couple hours drive to digi-key 