i have a iPod Touch, 3rd Generation, 8GB.
i clicked update(4.3.3), but it doesnt have all the new features.
for example, it doesnt have the multitasking or the background picture.. why?
Because you have a 2G ipod. Apple only made 32 and 64 GB 3G iPods. See:
Identifying iPod models
The 2G can only go to 4.2.1 an it does not support multitasking. See:
iPod touch: Which iOS 4 software features does my iPod touch support?
Retrieving data ...