I just found skitch from the wizards at plasq and I must admit that

It allows you to mark up photos rather easily. I’m trying to build what I’m HEREBY referring to as “totem posting” or building a pictorial life story of TheAnthroGeek and my lineage – and the indexing (i.e., pointing) feature on skitch was the perfect solution. Check out my initial draft of this project here: http://skitch.com/theanthrogeek/