You can create PDF sideshows with Photoshop in about... oh... 10 seconds. I'll show you how easy it really is.
First, put all the files you want in your slideshow into one folder (they don't have to be, it's just easier that way). Open the File Browser window in Photoshop by clicking the icon in your Option bar or Window > File Browser.
With the File Browser open, navigate to the folder where your slideshow images are stored.
Select the images you want in your slideshow. Ctrl + A will select all, holding Shift will select a range, and holding Ctrl will allow you to select and deselect specific images. Now, in the File Browser window, go to Automate > PDF Presentation.
When the PDF Presentation window opens, all of your selected files will be in the Source Files list.
In the Output Options, choose "Presentation". In the Presentation Options, set the time delay between each frame with the "Advance Every X Seconds" option. You can also choose if you want the slideshow to loop or not.
Finally, select the transition you want (if any) and click "Save". Save your file as whatever you want.
Now just set your PDF options, I left mine as the default, and press "OK". Now sit back, relax, and let Photoshop build your presentation.
The great thing about these slideshows, is that they're PDF format, which is very widely accepted and easy to share!
