Mercury
Planetary profile and vital statistics.
http://pds.jpl.nasa.gov/planets/welcome/mercury.htm

NSSDC: Mercury
From NASA's photo gallery.
http://nssdc.gsfc.nasa.gov/photo_gallery/PhotoGallery-Mercury.html

MESSENGER: NASA probe
Due for launch in 2004, it will reveal more about the innermost planet.
http://sd-www.jhuapl.edu/MESSENGER/

Mercury
.
http://www.solarviews.com/eng/mercury.htm

Constants and Equations: Mercury
Wide range of information about this planet.
http://www.tcaep.co.uk/astro/planets/mercury/

Mercury
NASA's Windows to the Universe
http://windows.arc.nasa.gov/cgi-bin/tour.cgi?link=/mercury/mercury.html&sn=0&cd=false&cdp=/windows3.html&art=ok&frp=/windows3.html&fr=f&tour=&sw=false&edu=mid

The Planet Mercury
good detail on this planet.
http://csep10.phys.utk.edu/astr161/lect/mercury/mercury.html

Mercury
From The Nine Planets multimedia tour of the solar system.
http://www.nineplanets.org/mercury.html

Mercury
Introduction to the closest planet to the Sun, with details of the Messenger mission.
http://www.harmsy.freeuk.com/mercury.html

Transit of Mercury: Live Images
This site will contain live images of the transit of Mercury across the face of the Sun as recorded at Worth Hill Observatory in May 2003.
http://home.freeuk.net/dgstrange/transit.mercury.2003/