I have been trying to get someone (anyone!) to measure the current to the Pi with no peripherals plugged in - just to give a baseline.
Already done, have a look in the "Requests for you lucky Pi owners" thread, but to summarise, with nothing other than the SD card but booted into Arch, ~330mA
With literally just power, around 70mA - but this leaves you with the GPU not even booted so not exactly useful.
With the SD card in, there's a couple of seconds where you get 100-150mA, then up to 300+ as it starts accessing the card and booting.
IMHO these 'baselines' aren't particularly useful as with nothing plugged in you're not able to actually use the thing.
Even with some stuff plugged in, the measurements still aren't useful - unless you happen to have exactly the same peripherals as I do and that's unlikely
However they do give you some sort of ballpark idea which was why I posted them..