tip: how to install liberated ROM
I was mystified as to how to get a liberated ROM onto my Aria. Docs & threads seemed to assume I knew my way around the tools. I did finally figure it out, and since there are probably others who are similarly confused, here's what I did:
First, I got the Unrevoked3 reflash utility and got my phone rooted. All you do is put your phone in USB debugging mode (checkbox under Settings->Applications->Development), connect it to your computer charge only, then run reflash.
Should probably mention here that the other threads cautioned you to do the Nandroid backup, so I'll echo that sentiment. You do that in recovery mode covered below.
Next, I took the R005 liberated ROM ZIP file and copied it to the SD card on my phone. On my first try I renamed the file and when I tried to install it it failed the checksum, so important not to rename the file. Once it's on the SD card, you power off the phone, then power it on while holding the volume down switch. That puts it into recovery mode. Choose "recovery" using the volume up/down, then press the power switch to select. Next choose "install zip", power to select. Finally choose the ROM ZIP file you want to install, and off it goes.