I would like to share my experience with a free tool for annotating family photos called FotoTagger, http://www.fototagger.com.
I use it to memorize people and events captured on family photos, especially on my group pictures. I can place notes directly on a picture and:
- Identify family members/ancestors
- Comment specific details (callouts are supported)
- Annotate places where photos were taken
- Hide annotations to view an original picture. When I don't need annotations, I click a button and they become hidden. It really looks great because I don't want to spoil old black-and-white family photos by embedding notes that cannot be eliminated
- Publish annotated pictures directly to blogs at Blogger.com and LiveJournal (but you can still can use Fototagger as a desktop tool!), etc.
What is also really cool is an ability to turn family photos to a searchable collection so any person ever captured could be found with ease.
I've used fototagger on a few of my online photos. Still experimenting with it. Once I get the hang of it, I think it will be great for me. I hate to look at a photo and not know who I am looking at. Will be great for dating also. I definitely plan on using it as I learn more about it. Wish my ancestors had it years ago, then maybe I'd know who was staring back at me in these older photos I look at!