I bricked mine also. What you want to do is go back to page 2 of the 'Tell us if you got the ICS....' thread. Download the cab file that airtio supplies, as well as the kdz zip. Pull your battery, hold down vol up and down, pop in the battery, then plug in the usb. This should put you in download mode.
Extract the kdz zip and run the msxml install. Open the UpTest program and on the bottom left you should see something about converting cab to kdz. Click the folder icon and pick the cab file you downloaded. When it is done, it will open the window for the folder where the kdz file is now. Close that app and open the KDZ_FW_UPD app. Set it to CDMA and DIAG and select the kdz file that you created. Then hit 'launch software update' and it should run through it. You should eventually see your phone reboot and, in my case, I saw the first update start to install and then the phone rebooted again. Phone took a little time on the loading screen, but evenually booted up to my home screen and gave me the 'Install Complete' message. I think I'm good again now.
Only other things I did was I saw in one post that you should go into device manager and disable the LG modem that appears. Not sure if that was necessary in the end though. Hope that helps, and thanks to airtioteclint for his help!