LOVING the Lehto 125/900mhz kernal. Running it for about 2-3 days. No issues, excessive heat. Plays YouTube well, faster interface, etc.

Battery:
Hard to really say for sure. First day I thought it was lasting longer by about 10%. Second day I thought maybe draining 10% faster. My conclusion is that battery life very dependent on usage. Heavy usage with processor hitting 900mhz more often makes battery drain faster than stock. On light usage day, the 125mhz idle makes battery last longer than stock.

Heat:
Very minimal increase in heat. That said, I am not much of a gamer, so the most I stressed my CPU was probably 3-5 minutes.

About info is gone. Still ranges between 125/900mhz after phone usage. Stays at 500mhz -900 mhz when on USB. I reinstalled Firefox as I think Flash had stopped working.

Tried the Lehto 125/950mhz + 500mhz dsp kernal and it was slower, jerky.

Also tried the Titan maemo-kernel-flasher but I couldnt figure out how to over clock and it seemed like every one was still ironing it out (phone app issue and such) so I am going to wait on that.

Have to say, I think the N900 name and 900mhz working so well seems too perfect to be a coincidence. I think Nokia Marketing wanted 900 mhz, Nokia engineering wanted to play it safe, and Nokia Legal said lets cover our *** and avoid bad PR from a brick or two.

THANK YOU SO MUCH GUYS, THIS IS AWESOME!
(Finally, sorry for adding yet another post to this epic thread. Took me like 6 hrs to read this!)