yes.. you can use the freebie.. I use and recommend proshow gold or producer but it does cost some $$$.. I use PSP about once a week for making client DVD's.. easy, quick and wonderfully professional looking.. options built right in to save for website gallery and then upload.
To post on the family website, you'll need to be sure to put the finished product in a format that others can see.. Again, PSP does this and creates it so you just click Play and off you go.. if you want to create a self running exe.. then you can upload the file to somplace free like rapidshare.com and your family can download the file and run on their PC.
Check out these for some idea of what I'm talking about... great software! You'll just need to install a firefox/IE plugin to view the slideshow... its safe!
http://www.photodex.com/sharing/spot...shows_peg.html