iOS: If you like to add a little context to your photos, Sunlit is an app that allows you to turn your photos into a pretty but simple journal. All you need is a free App.net account.
The app itself looks great and provides fantastic maps to go along with your photos as well as a place to write down any thoughts you might have. You journal is private by default, but if you really like what you have, you can instantly publish your journal to a web page to share with others.
The App.net integration makes Sunlit less approachable for some, but it's worth checking out if you're looking for a solid photo-journalling app.
Sunlit (free) [iTunes App Store]