HDR Images can be created with full photoshop.
Castle.jpg
Any camera that allows manual over- or under-exposure of a photo can be used to create HDR images.

Lets look at a few examples
http://speckyboy.com/2009/07/09/50-beautiful-hdr-images-from-50-world-cities/


Photoshop CS2 introduced the Merge to HDR function.

In many ways, Photoshop CS2's HDR function is the holy grail of dynamic range. With properly shot and processed files it allows photographers to easily create images that were previously impossible, or at least very difficult to accomplish. But, good as it is, like a gun or nuclear power, it can be a force for evil as well as good.
Not every image needs to have 10-15 stops of dynamic range. In fact, most photographs look quite nice, thank you very much, with the 5-7 stops of dynamic range that we're used to. I fully expect to see some really silly if not downright ugly images in the months ahead, as photographers get their copies of Photoshop CS2 and start discovering what the HDR function is capable of.
But, as with all such tool [sic], in the hands of sensitive artists and competent craftsmen, I'm sure that we will start to be shown the world in new and exciting ways.
– Michael Reichmann , Luminous Landscape


A bit on HDR Images from Wikipedia:


High dynamic range imaging

From Wikipedia, the free encyclopedia


In image processing, computer graphics, and photography, high dynamic range imaging (HDRI or just HDR) is a set of techniques that allow a greater dynamic range of luminances between the lightest and darkest areas of an image than standard digital imaging techniques or photographic methods. This wider dynamic range allows HDR images to more accurately represent the wide range of intensity levels found in real scenes, ranging from direct sunlight to faint starlight.[1]
The two main sources of HDR imagery are computer renderings and merging of multiple photographs, which in turn are known as low dynamic range (LDR)[2] (also called standard dynamic range (SDR)[3]) photographs.
Tone mapping techniques, which reduce overall contrast to facilitate display of HDR images on devices with lower dynamic range, can be applied to produce images with preserved or exaggerated local contrast for artistic effect.