I used this script. You just need to know how to export a path variable to where your /sdk/tools folder is located.
Adding directories to the Mac OS X PATH variable | keito.me shows how to do this. Otherwise it is just a matter of running the script with ./adb_recovery_helper.sh
Not very hard and did finally help me to root with a Verizon Sandisk 2GB card.
If you get in, just follow the directions very carefully. When it says to press any button when the file verification shows, press any button on your droid, not your mac. This interrupts the validation and allows unrevoked for incredible to insert.
Really, the hardest part is getting the damn phone into adb recovery. I am sure in a few days, the exploit will be better understood and scripts will time it better, ie, iphone jailbraking.