one reason for a battery not lasting as long as the manufacturers claim is that the apps are not fully closed. On an Apple product press the home key twice in quick succession and you will see all
open apps just close all the unecessary ones. This doesn't delete the app, just click on the app icon to use it again. Apple is notorious for the amount of updates it produces and every app update will remain open till you close it in the above way.
Samsung are not so bad for updates but apps can remain open and waste battery life. In the bottom right hand corner (Galaxy tab 10.1.. not sure if the others are the same) you can find all open apps and close them. Or alternatively you can go into the settings and close them that way.
OHs Tab 10.1, (last years xmas pressie). The icon just says browser, perhaps I should try and find out what browser it uses... (embarrassed smilie) thanks for the tip Nick, will try it out later

I also got a keyboard/cover for my ipad this Christmas, we tried it on another ipad but has gone back in its box as I find the extra weight makes it combersome.... It was an expensive one too!!!!