Hi guys, i'm back again, with lots of questions. Hope you guys won't mind so much.
1. Major problem: BATTERY WON'T LAST LONG! (Yes I've followed Samsung's instructions to drain the battery first before charging for 8 hours long). Listening to music thru earphones for 2 hours only used 3% of battery, but other's, wow.
My usage for today:

Any ideas? (i DID: Turn off WiFi all day, turn down the brightness, i DID NOT turn on data as i don't have a data plan)
2. You know those background running apps? I got a appkiller and with that app, i found out that all the apps are popping up secretly. And after i killed them, they kept on started to run secretly (even the samsung app killer doesn't show them).
THESE APPS (SOME OF THEM I DIDN'T EVEN LAUNCHED THEM) KEPT ON RUNNING IN BACKGROUND

Hey, any ideas how to stop them?
3. z4root won't work? i tried both temporary and permanent root but nothing happened?
4. Do I need an SD card for this phone?
5. This phones hanged twice, i mean, REALLY HANG.
6. GPS software for this device? (e.g. PAPAGO)?
7. Where to get cheap and nice accessories for this phone? (Speaker dock, portable battery, etc.)
8. Will you spend RM88 for a silicone case and RM188 for a flip pouch for this phone?
Awaiting for your reply. (it's rather long, sry about that, try to remove the images in my quote) THANKS IN ADVANCE!
first of all, get rid of samsung bloatware, second it seems to me certain software is causing wakelock. thrid stop using any task killer. fourth SD is not a must unless u got not enough space. GPS can try sygic. can try lowyat plaza for accessories. and no never in my life i will ever ever EVER buy a casing that cost more than rm20, and i dont use flip pouch. hope this helps