F-Spot is the default Photo Manager in Ubuntu Gnome,but it will be replaced with Shotwell in Ubuntu 10.10 Maverick Meerkat.If you would like to use this default Photo Manager,you can add its PPA into your repository and keep updating it.
Currently the latest F-Spot is the version 0.7.1.ppa:f-spot/f-spot-ppa had added the package for Ubuntu 10.04.I think it will add the package for Ubuntu 10.10 soon and keep the latest packages updated.
Open terminal from Applications->Accessories menu,run this command to add the PPA into your repository:
sudo add-apt-repository ppa:f-spot/f-spot-ppa
update and install the latest F-Spot:
sudo apt-get update sudo apt-get install f-spot
Launch new installed F-Spot in Applications->Graphics menu.