Does 1.5.6-r2 work with USBtinyISP?

raschemmel:

I have installed the latest version of avrdude.

I keep hearing about avrdude. I googled it and it says it's a dos command line program. Do I need it ?

If you've installed the IDE, you already have it.

The IDE calls avrdude to do the actual chip programming. You see the avrdude output in the window when you build with "verbose output: upload" checked.