The Sony Party-Shot IPT-DS1 works with both the DSC-WX1 and DSC-TX1 Cyber-shot digital camera models. It is a base that tilts (24 degrees) and pans (360 deg.) to locate subjects (works off of the cameras face and smile detection setting). Base takes two AA batteries, is portable, and will mount to most tripods. It captures your photos for you, even adjusting the composition, for up to 11 hours.
New, $99. Find it here.