This ROM just gets better and better.
I did a backup last night then ran the cpu.sh script. I chose ULV 100000, 80000, 50000, 350000. Let it charge over night and took it off of the charger at 6AM.
I have had about 15 minutes of calls, checked emails several times, used Google Listen for 35 minutes on the way in to work and have had 16 sms messages.
My battery has just now, 11:45 AM, dropped down to 90%.
I was running the ULV 1.2GHZ but I really didn't notice a performance gain. I do notice the battery gain though by dropping the high down to 1.0GHz and the low down to .35Ghz.
Replying to my own post:
After 24 hours with out a charge, I woke up with my battery at %50.
I totaled up my phone call talk time since last charge - 28 minutes.
Total sms texts - 35
Used Google Listen for about an hour total.
Some moderate use (10 - 15 min) of Angry Birds.
I can't say enough about this ROM and underclocking. Again, I really did not notice any performance gain when I was overclocking to 1.2GHz.