AVR Dragon buffer board
The AVR Dragon is a very cheep, very useful device for use with AVR development. At only $53 its extremely cheap solution for burning your uC's via ISP/JTAG. On top of that it allows you to debug in real time using JTAG or dW. The problem is a lot of the protection circuitry was removed to make it so cheap, so its very fragile. This board will act as a buffer between the Dragon and the target system, protecting the Dragon from harm. Here are eagle sch/board files. I have tested ISP with this board and it works fine. There is an issue with JTAG (its not working) but it really doesn't bother me because I only really use ISP/dW. The original thread on AVRfreaks is here.