Since joining Ipernity, I have been most impressed by the HDR images posted on this web-site.
I have begun experimenting with HDR, but without using a tripod. My images are the result of attempting to hold the camera in one position whilst taking pairs of photos at different exposures.
At first, I used the Photomatix programme in its trial version, which produces pictures with a Photomatix watermark. Now, I am experimenting with a free software package called QTPFSGUI. This seems very good, but a little slower than Photomatix.
What I find particularly interesting is the 'ghosting effect' that occurs if someone or something moves during the capturing of the two images in a pair.
You may view my efforts in the album: http://www.ipernity.com/doc/adam/album/75212