F-Spot is one of the most feature-filled photo manager/album out there today. And it's free! Some of the features included in the latest version are the ability to work with 16 different types of images, importing from hard drives, cameras, or iPods, tagging, searching, grouping, and full screen and slideshow modes. F-Spot also supports viewing and exporting EXIF and XMP metadata in your images.
Is that all? No, far from it actually. F-Spot also has a built-in photo editor which allows you to do basic tasks like cropping, resizing and rotating images. You can also do color adjustments to your images like changing contrast, brightness, hue, saturation and temperature. The icing on the cake is in the form of various ways to export your photos. You can burn them to a CD from within the application itself, or upload your images to one of the many media-uploading websites (Flickr, 23, Picasa Web, SmugMug). If you have your own website running a content-management system like Gallery or O.r.i.g.i.n.a.l., F-Spot will support that too!
F-Spot can also be extended using extensions which can be downloaded off F-Spot's site.