Gah, I was happy with the battery life before but hadn't messed with the phone for a while. So I thought I'd give this new RedPill kernel a try. Not good so far, battery life well down yesterday, trying today with voltage control also running and not looking too clever either... Worse thing is I can't remember which kernel I was running before, doh!
Speedmod is great for battery but doesn't have any extras, its a very "lightweight" kernel. I was using NEAK on CheckROM with some very good results before I got too tempted by the ICS builds

If there's something specifically in RedPill that you wanted, try this cleaning script then re-flash. http://forum.xda-developers.com/showthread.php?t=1363738