Just add individual contacts or groups of contacts with whom you'd like to share your images. Sharing is as easy as dragging and dropping your photos over the person you'd like to see them. They will then receive an email inviting them to open the program and take a look.
You can also use PicMe Photo Sharing as an image viewer. The program arranges photos into different groups, and you can then view them as thumbnails or access the folder itself to look at the full size versions.
PicMe Photo Sharing easily integrates with web services like Flickr, Facebook, and Google Picasa - you can even update your profile picture without having to leave the program interface.