If it's anything like the EVO's camera, it wont be useful for much besides webcam video and acting as a neo-ghetto mirror. The rear cam with autofocus and flash is just soooooo much better for stills (and video, and frankly everything.)
Yes you can take pictures with the front-facing camera. As many have mentioned, it is only VGA, so it won't be the best picture quality. But if you just wonna snap a quick pic with a friend so you can make it your Facebook picture or something, you absolutely can.
One thing I do want to know is, can you take VIDEO'S with the front camera??
I just recently got my Epic and I tried using the Front facing camera to snap a picture of myself but the screen stays black and when I hit the snapshot button to take the picture what shows as the picture is a green box? Is there a way to fix this?
I had a similar issue after I dropped the phone. Front Facing Camera no longer worked (along with the notification LED). Took it into Sprint store - they replaced the top portion of the phone (screen) for $35.