That's ~27ma for the floor with the screen off, not just backlight off, EVDO connected and idle, cpu idle.
Screen on/backlight off (ie, hold down power button until bl off) ~ 32ma
So the touchscreen/lcd draws ~5ma.
Some screenshots, all with overclock @ 520mhz and those powersaving tweaks in
- tricky to catch the power level with screen off ;D
First three show no EVDO, idle screen+bl on (66), idle bl off (37) and idle screen off (29),
Last one shows me powering on evdo + email check (350ma spike) and then power off screen, power back on to take shot (34ma, but you can see I missed the low point...)
Having the screenshot app up and total commander up seems to cost me a few ma
So yeah, does not seem to hurt at all to have it overclocked, at least for standby time.