jpg2pdf is a very flexible and powerful program. It can convert a collection of jpeg images into a unique PDF.
jpg2pdf is a native converter, you don't need to pass through PostScript format
jpg2pdf is specific to put your jpeg images inside a PDF, so
you can create (batch) a unique PDF file from your JPEG archive (using * and ? metachars: e.g. a*.jpg or recursively)
you can add to your PDF collection of jpeg images transition effects
you can set PDF full-screen mode e.g. to show to your friend your digital photos made by your digital camera
you can create your personalize background and foreground layer