I see Julius Spencer (known here) has just released Power Up v1.04 into the Android Market.
If you're a powershop.co.nz customer (I am) then this app will let you:
1 Enter meter readings. Especially useful if your Android phone can't do Flash or you want a nice, big, easy to use dialog.
2. See the current meter estimate (not actual reading, their estimate, based on recent readings) from Powershop
3. See many useful details about your account, like the ICP number
4. Buy power if your account is in deficit and you have no units.
It costs $1. I bought it. Support the dev! :-)
Thanks to Julius!