Hey folks, just wanted to let you know that using the desk clock apk from the newly leaked G2 build fixes the "Set Alarm" voice command! It's true. See here
for info about the G2 build dump. Credit to Zapote21
for doing the work of examining the dump and turning it into a nice zip file.
First, remove the desk clock apk you already have from the /system/app directory, then install the new DeskClockGoogle apk from the G2 build (which is attached). You can install it via adb or by copying it to your SD card and installing from the phone, both work. Once it's installed, start a new voice search and say, "set alarm 8am" or whatever and it works!