Nuages is a simple and easy to use photoblog engine.
I'm currently using it to run my own photoblog at http://sculpting-in-time.ro.
Features:
- no host required (just create a Google AppEngine account)
- easy to install (due to Google's AppEngine SDK)
- very little configuration needed
- browse images by location, categories or just in reverse chronological order
- fully customizable templates
- friendly URLs