A new version of F-Spot the default photo manager for Lucid Lynx has been released. The new version 0.7.2 comes with lots of bug fixes and stability improvements and is a step towards release of F-Spot 0.8.0 one month from now.
The new version is not available in repositories yet but will be packaged soon enough. Add this repository to your software sources to keep yourself updated.
sudo add-apt-repository ppa:f-spot/f-spot-ppa
sudo apt-get update
Edit: Shotwell has already been announced as the defualt photo manager for Maverick Meerkat.