I suggest you should take your pictures under a well-lighted place or under a bright place, that way your phone camera sensor is able to grab most of the light thus faster shutter speed and the result is the camera will be able to capture all the details rendering sharp images.  EDIT: Brighter places, less noise.

Aside from brighter places, while taking a picture under a not so well-lit places you need a firm and steady hand (we call it the steel hand, practise makes perfect  ) As told by a veteran photographer (my photography lecturer), he told us while holding the camera with both hands, tuck both ends of our elbow towards our lower chest line, make sure you're giving it some force so your hands are steady, it may look very awkward at first but trust me, this works most of the time, stand firm on your ground. While pressing the shutter button, hold your breathe and fire away.

For the best result, just take several shots at the and hopefully you'll land on your perfect picture. 

Just sharing some photography tips, which works on most of the cameras out there. 

Does anyone know how to do a screenshot on the Lumia 900?

Just switch to Lumia 900 from Android. Love the minimalistic UI.
The thing that bugs me is WhatsApp push notifications, laggy or not even push at all.
Any tips?

Including messages and contacts ? Some ppl said contact/windows live id might stay intact. 

okay please video test on the new breed hahaha