APOD Grabber 1.0.3 helps view, browse, and download images from NASA's Astronomy Picture of the Day web site. http://antwrp.gsfc.nasa.gov/apod/astropix.html It shows all the proper credits, explanations, and descriptions, provides a link to the viewed image's web page, and can set the current image as your desktop picture. Recent changes include a fix for a crash when resizing the main window while an image is being loaded, drawing of GIF images with the proper color table, and other bug fixes. APOD Grabber is free for Mac OS X 10.1 and up. http://www.railheaddesign.com/pages/software/apodgrabber/apodgrabber.html
NASA maintains an archive of these pictures at http://antwrp.gsfc.nasa.gov/apod/archivepix.html