use p3 droid kernels you get insane battery life, well insane for running at 1.2 ghz anyways. Their great because the lowest slot is 125 rather than 250. This kernel with setcpu gives me a full day of battery life.
Now that Froyo seems to be able to handle 125Mhz coming out of sleep/standby, that's the only thing missing from Chevy's (at least to try)