High dynamic Range Photography technique...

Photoshop has a built in HDR assembler, here is a quick summary of the steps:

• Take at least 3 photos of subject while bracketing (eg over / under expose changing the shutter speed, !not! the aperture), preferably using a tripod (Photoshop will more or less compensate for camera shake otherwise).
  
• Open the photos in Photoshop
• Click File > Automate > Merge to HDR.
• This saves the image as a pbs / 32 bits per channel.
  
• Convert to 16 bits per channel (for a print format), adjusting histogram / tonal range (local adaptation)
• or convert to 8 bits per channel (for a jpg/ screen only)

A more detailed tutorial: http://www.backingwinds.blogspot.com/2006/10/how-to-create-professional-hdr-images.html