Heavy use for me is not using wifi when browsing the internet at home ( i live in a church and the s2 doesn't pickup my wireless in my living room) along side auto sync my emails on weekends every 30 mins, playing games on way to work which is an hour each way, calling home which always seems to take longer than your average call!.
casual use for me is the occasional text message short phone call and checking the football scores
Sandisk have a free app that allows you to move stuff round from internal to external storage and to any cloud services you have as well. I know it's possible to do it without but it's a nice and easy all in one. Ohh and you can schedule backups of files (not system stuff) with it as well. Came with my fancy new 32Gb Ultra MicroSD.
ha ha niether ! the church was converted into flats in the 80's so the walls are very thick some still have the arches built in but the ceilings are paper thin :-( Bsoltan, Catachamonkey and Reids have been there they can contest the crapness of my Wifi.
Sympathies - I've had quite few dealings with ecclesiastical buildings and wifi.
A bloke I work with always recommends routers next to windows ((the glass type, not the MS type) to get round thick internal walls, or repeaters to take the signal up a floor, across and down (where there's a second floor to do that). If there's any outside space, then that's a good option too.
Galaxy Pack is a great buy at £1.29. You get a selection of live wallpapers, some of which can be customised to add or remove stars and change their colours. Once you've chosen a galaxy you're able to rotate it in 3D on each of your screens. Each is as beautiful as the next!