CataThumbs is a free graphic tool from the same authors as eRecall and DigiCat (among other tools) which has been designed to create the popular thumbnails, small representations of larger images, which, when you click on them, show the full-sized version. You can use them for your own albums, or to insert in your website.
CataThumbs lets you print a thumbnail catalogue directly from the printer, or create from them documents like HTML, RTF (Word) or PDF.
CataThumbs also supports the best known image formats.