So far this is what I've found...
Lith Rom Manager doesn't recognize this.
When I put it into the dock it's back to Green instead of that nice Blue.
My wallpaper which was the nice nexus one now is weird - the lines are bigger.
I had a 1Ghz jrummy Kernal and now SetCpu has it at 850 max.
Upper right time is black on black.
LithiumMod has been rebuilt from the ground up. I'm not sure what you're referring to regarding the wallpaper. The kernel included is a new custom kernel, but jdlfg is working on a new one that should be ready very soon. Default max should be around 850, but should be OC'able to probably 1298.
As for the black on black time, it sounds like you've applied a theme or something. There are currently no themes that I know of that are supported. We will probably be developing a few of our own themes, and welcome any themers that want to put their own spin on the ROM work we're doing. But I think the main thing to remember is that the new LithiumMod is not a continuation of the previous generation
... it will be newer, better, stronger....