QUOTE(lencent @ Dec 14 2009, 01:40 AM)
means only flash can help in this scenario?

tot i can play around with the metering to get a proper expose backlit portrait shoot...
not really sunlight at the back, but more like the background is brighter.
used diffused built in flash, the skin tone still ok ok, but i increased the EV to +1.3. Take a look at the background, it is totally overexposed

In this kind of scenario, you would need an external flash. If you want to get a balanced picture without doing extensive PP, here's what you can do:
1. Have an external flash ready.
2. Meter the background to get a proper exposure and lock the exposure on the background.
Step no. 2 will guarantee you that your subject and/or foreground will be UNDEREXPOSED. So to bring it up:
3. Use your flash in manual mode and dial in the setting so that the subject will be properly exposed. The background will not blow out coz you've metered it correctly.
It may be time consuming to set/reset the flash power output so in a hectic shoot, it may not be practical. I haven't tried TTL in this kind of scenario so I don't know if it will give the correct flash output.
Else you can find a different angle where the background is not so bright.
Hope that helps.