I've now downloaded the fullscreen playback Soundslides Plus which was just released in beta form, and found it to be a brilliant step forward for this product, which as you can easily guess, I'm a fan of.
I spent a few minutes creating a 'super-sized' slideshow, which allows viewers to the full screen option on their monitors. The slideshow will be shortly uploaded to my website.
The updated Beta version of Soundslides can be downloaded from here
Other competing products such as Fotomagico and Photopresenter may be equally good, but since I've started to use Soundslides I found it to be ideally suited to my requirements. My experience with its customer service has been perfect, prompt and efficient.