Android phones, apps and tablets

Ok, i'm gonna jump in and put words in Ed's mouth. On Android 2.2, the data connection is called "mobile network". Turning it off will save battery but you will have to turn it back on to get mail, surf the Web etc. basically like having a dial up modem rather than always on internet.

A half way house is to turn off 3g, unless you need it. You can get widgets to help with this.

Dammit, buy a kindle. Problem solved. You can get the cheap one and use tetheting

I have a Kindle and would normally have used it.

Ironically however the battery was flat.