After building out the USBtinyISP kit, I found it cumbersome to have to remember the pin out of the 6 pin ISP header and map that to the proper pins on the ATTinyXX series microcontroller. I'm of the camp that things should be made simple and easy to use. Especially repetitive tasks that could be prone to human error.
What does the cradle look like?
Some photos of my implementation
Inspiration and a couple of the diagrams in this post have come from here and here. I think for a project like this it would be useful to be able to make my own printed circuit boards. I've put it on my todo list and I hope to get to it soon.